| 1573168 |
weather fleck |
|
Air pollution injury (weather fleck) on tobacco. May 1997 |
| 1573165 |
weather fleck |
|
Air pollution injury (weather fleck) on tobacco. May 1997 |
| 1573166 |
weather fleck |
|
Air pollution injury (weather fleck) on tobacco. May 1997 |
| 1573164 |
weather fleck |
|
Air pollution injury (weather fleck) on tobacco. May 1997 |
| 0027084 |
root rot/damping off |
Rhizoctonia spp. |
clean stem - bottom, vs rhizoctonia stem damage - top and middle plants |
| 5472517 |
Pythium diseases |
Pythium spp. |
|
| 0027022 |
tobacco thrips |
Frankliniella fusca |
|
| 0027033 |
tobacco aphid |
Myzus nicotianae |
|
| 5436389 |
southern blight |
Sclerotium rolfsii |
|
| 5436390 |
southern blight |
Sclerotium rolfsii |
|
| 5436391 |
southern blight |
Sclerotium rolfsii |
|
| 5436392 |
southern blight |
Sclerotium rolfsii |
|
| 5436383 |
black root rot |
Thielaviopsis basicola |
|
| 5436384 |
black root rot |
Thielaviopsis basicola |
|
| 5436385 |
black root rot |
Thielaviopsis basicola |
|
| 5436386 |
black root rot |
Thielaviopsis basicola |
|
| 5436387 |
black root rot |
Thielaviopsis basicola |
|
| 5436388 |
black root rot |
Thielaviopsis basicola |
|
| 1440090 |
potassium deficiency |
|
Symptoms of K deficiency in tobacco first appear on lower or middle leaves and move up the plant as the problem becomes more severe. The distinguishing characteristic is mottled or "scorched" appearance that develops at the tips and along the edges of leaves. In the early stages, mottles are pale green or yellow, followed by the development of brown or dead centers. As the deficiency increases, mottles tend to run together and the dead areas fall out resulting in ragged leaf margins. Because the remaining green areas continue to grow, leaves often develop a crumpled or puckered appearance with edges cupping downward. K deficiencies appear to be encouraged by dry weather. Also, tobacco is usually less stunted by a deficiency of K than by a deficiency of either N or P. |
| 1440101 |
tobacco wireworm |
Conoderus vespertinus |
Wireworms (various species) are the major soil insects attacking tobacco. The yellow to brown, hard-bodied larvae are slender and cylindrical. The adult is a click beetle. Wireworms hatch in the summer, spend the winter in the soil and are usually most destructive to newly transplanted tobacco. Wireworm larvae cut off small underground stems and roots and bore into larger stems and roots. They may be found tunneling in stems near the soil surface . Affected plants may become stunted or wilt and die within a few days. Tobacco following sod may be damaged by wireworms for one to five years because some species have long life cycles. |
| 1440047 |
black root rot |
Thielaviopsis basicola |
Uneven growth of tobacco in the field is indicative of black root rot. Affected plants often become yellowed and are smaller than neighboring healthy plants. Stunting is more evident during the early part of the growing season and during cool, wet seasons. On hot days, leaves of the diseased plants wilt more rapidly than those of healthy plants, but recover during the night. Plants usually grow out of the problem as soil temperatures rise, unless the variety is highly susceptible to the fungus and cool, wet soil conditions prevail. the most distinctive symptoms of black root rot occur on the roots. The entire root system is greatly reduced with smaller roots exhibiting a typical brown to black discoloration of their tips, and larger roots having brown or black spots on their surface. The outer root tissue may slough easily. |
| 1402036 |
tobacco cyst nematode |
Globodera solanacearum |
Plants infected by this nematode are stunted and have reduced root systems. Roots are pruned and may have brown decayed areas. Female nematodes, the size of tobacco seed, may be seen attached to the roots. They are round and vary in color from white to dark brown. Flowering of plants may be delayed up to two months, and leaves on infected plants are greener than normal. Stunted plants may appear to recover, but they will never achieve normal size. Root examination and soil assays are necessary for accurate diagnosis. |
| 1233223 |
tobacco wireworm |
Conoderus vespertinus |
on root |
| 5430062 |
sulfentrazone |
|
Damage from herbicide, Sulfentrazone
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. 2- a death (whitening) of the finer veins and a little puckering. This can be associated with the herbicide "Spartan" when taken up through the roots. The injury is associated with movement of the herbicide into the root zone due to incorporation and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5430043 |
sulfentrazone |
|
Herbicide damage from Sulfentrazone
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. 2- a death (whitening) of the finer veins and a little puckering. This can be associated with the herbicide "Spartan" when taken up through the roots. The injury is associated with movement of the herbicide into the root zone due to incorporation and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5430044 |
sulfentrazone |
|
Damage from herbicide, Sulfentrazone
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. 2- a death (whitening) of the finer veins and a little puckering. This can be associated with the herbicide "Spartan" when taken up through the roots. The injury is associated with movement of the herbicide into the root zone due to incorporation and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5430045 |
sulfentrazone |
|
herbicide damage of Sulfentrazone
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. 2- a death (whitening) of the finer veins and a little puckering. This can be associated with the herbicide "Spartan" when taken up through the roots. The injury is associated with movement of the herbicide into the root zone due to incorporation and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5430063 |
sulfentrazone |
|
Damage from herbicide, Sulfentrazone
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. 2- a death (whitening) of the finer veins and a little puckering. This can be associated with the herbicide "Spartan" when taken up through the roots. The injury is associated with movement of the herbicide into the root zone due to incorporation and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5430091 |
Pythium diseases |
Pythium spp. |
filamentous and terminal sporagia
Host: Nicotiana tabacum variety Tennessee 90 |
| 5430092 |
Pythium diseases |
Pythium spp. |
filamentous and terminal sporagia
Host: Nicotina tabacum variety Tennessee 90 |
| 5424469 |
Pythium diseases |
Pythium spp. |
A float tray showing an area with advanced stunting and yellow of infected plants. |
| 5424470 |
Pythium diseases |
Pythium spp. |
Pythium infected roots seen coming out the bottom of the float tray on the right, healthy roots on the left. |
| 5424471 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Plants usually rot at the soilless mix surface and continue to rot until the entire plant dies. |
| 5424472 |
Sclerotinia rot |
Sclerotinia sclerotiorum |
Infection is usually seen on a group of plants in a float tray. As the plants die and more air gets into this area, the advance of the fungus is limited by the less humid conditions created. |
| 1402032 |
Tobacco Etch Virus |
Potyvirus TEV |
Symptoms vary depending on the strain of the virus present and the conditions of plant growth. Veinclearing (lightening of the tissue in and around veins) is followed by a faint, light-green mottling of the leaf. This mottling is similar to that observed with tobacco mosaic; but with etch, the blotches are much less pronounced. Older infected leaves may show a stippled pattern of numerous, small, white flecks and fine lines (etchings), especially along veins. |
| 1440061 |
houseburn |
|
Houseburn is also known as pole rot, barn rot, pole sweat, shed burn, vein rot, and stem mold. Symptoms include white mold on midveins, odor of rotting tobacco, and partial decay caused by several species of fungi and bacteria. Freshly harvested tobacco is not highly susceptible, but damage may begin when the cure progresses through the yellowing stage and portions of the leaf begin to die. Injury occurs when microorganisms attack leaves that become moist during periods of high humidity lasting longer than 24 hours. Damage is measured in weight loss and lowered leaf quality and can range from mild to severe. Conditions which favor harvest of immature tobacco and prolonged leaf wetness in the barn will encourage houseburn |
| 1233225 |
root rot/damping off |
Rhizoctonia spp. |
Rhizoctonia spp. injury (left and right) and Pythium spp. injury in center to young seedlings. Damping off is a problem in tobacco plant beds but can be a problem in the field soon after transplanting. Pythium spp. causes a watery, soft rot of the lower stem and root system and is more common during cool, wet weather. Rhizoctonia causes brown, irregular cankers to develop on the lower stems and injury is more common during warm weather. Lesions can enlarge and girdle the stem while plants that are not severely damaged by Rhizoctonia may recover in the field. |
| 1402024 |
brown spot |
Alternaria alternata |
This fungal disease appears first on the older leaves as circular, brown spots (1/4 to 1 1/4 inches in diameter) with sharply defined margins. Concentric circles (rings) are often noticeable within the spots. As the leaves approach maturity, a yellowish "halo" of varying width often forms around the lesion. Lesions may merge, forming large areas of dead tissue. During humid weather, sporulation of the fungus may be abundant, giving the lesions a black, dusty appearance. Brown spot is most severe as the plant approaches maturity, and the disease progresses from the lower to the upper leaves. Disease severity depends much on the weather, the overall health of the plant, varietal tolerance, and harvest rate. |
| 0027012 |
tobacco hornworm |
Manduca sexta |
|
| 1440060 |
branched broomrape |
Orobanche ramosa |
Plants attacked by broomrape appear sickly, yellowish, and starved, but have few distinguishing symptoms. The presence of small white, yellow, or purple plants with blue flowers growing near the base of the affected tobacco plant is the most diagnostic feature of broomrape. Close examination should reveal that the parasitic plants' roots are attached to the tobacco plant. Stunting symptoms occur because the broomrape plant is taking much of the tobacco plant's food. Affected plants may be located singly or clustered. Several different Orobanche species may parasitize tobacco. |
| 5424474 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
The characteristic "oak leaf" symptom is evident on this single leaf. |
| 1549319 |
tobacco aphid |
Myzus nicotianae |
|
| 5332060 |
brown spot |
Alternaria alternata |
|
| 5368705 |
Phytophthora blight |
Phytophthora nicotianae |
Asexual spore-producing bodies called "sporangia" of the fungus Phytophthora parasitica var. nicotianae. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. |
| 5368293 |
Phytophthora blight |
Phytophthora nicotianae |
Zoospores swimming away from sporangium. From narrowleaf madole variety. |
| 1525661 |
Phytophthora blight |
Phytophthora nicotianae |
sporangia |
| 5332061 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
|
| 5368291 |
Phytophthora blight |
Phytophthora nicotianae |
Sporangium ready to release its zoospores. From narrowleaf madole variety. |
| 5368292 |
Phytophthora blight |
Phytophthora nicotianae |
Zoospores swimming out of sporangium. From narrowleaf madole variety. |
| 5368549 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Variety VA 359 |
| 5368550 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them.Variety VA 359 |
| 5368551 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Variety VA 359 |
| 5368552 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Variety VA 359 |
| 5368655 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Dark variety DF 911. |
| 5368656 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Dark variety DF 911. |
| 5368657 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. Dark variety DF 911. |
| 5368883 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
On dark tobacco, narrowleaf madole shown, the spots have a little bit different look on dark tobacco because you do not usually see the yellow halo you will see on burley varieties, although a grouping of spots can cause an area of the leaf to turn yellow. Also interior portions of the spots look darker than those on burley. |
| 5368884 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
On dark tobacco, narrowleaf madole shown, the spots have a little bit different look on dark tobacco because you do not usually see the yellow halo you will see on burley varieties, although a grouping of spots can cause an area of the leaf to turn yellow. Also interior portions of the spots look darker than those on burley. |
| 5368885 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
Bacteria can be seen oozing from the infected leaf tissue. Narrowleaf Madole. |
| 5368886 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
Bacteria can be seen oozing from the infected leaf tissue. Narrowleaf Madole. |
| 5368365 |
Tobacco Streak Virus |
Ilarvirus TSV |
It is characterized by striking patterns of necrotic leaf tissue usually bearing a close relation to the veins. Some leavesmay be affected on one side only. Midribs have dead streaks and the small veins are darkened. Stalks can show depressed dead areas. Dark tobacco. |
| 5368366 |
Tobacco Streak Virus |
Ilarvirus TSV |
It is characterized by striking patterns of necrotic leaf tissue usually bearing a close relation to the veins. Some leavesmay be affected on one side only. Midribs have dead streaks and the small veins are darkened. Stalks can show depressed dead areas. Dark tobacco. |
| 5368367 |
Tobacco Streak Virus |
Ilarvirus TSV |
It is characterized by striking patterns of necrotic leaf tissue usually bearing a close relation to the veins. Some leavesmay be affected on one side only. Midribs have dead streaks and the small veins are darkened. Stalks can show depressed dead areas. Dark tobacco. |
| 5368368 |
Tobacco Streak Virus |
Ilarvirus TSV |
It is characterized by striking patterns of necrotic leaf tissue usually bearing a close relation to the veins. Some leavesmay be affected on one side only. Midribs have dead streaks and the small veins are darkened. Stalks can show depressed dead areas. Dark tobacco. |
| 5368377 |
chemicals |
|
Burley tobacco leaves with large spots with a water-soaked margin seen more clearlyon the bottom side of the leaves. Image is of the top side of the leaves. Azoxystrobin (fungicide) injury. |
| 5368378 |
chemicals |
|
Burley tobacco leaves with large spots with a water-soaked margin seen more clearlyon the bottom side of the leaves. Image is of the bottom side of leaves. Azoxystrobin (fungicide) injury. |
| 5368502 |
fungicides |
|
Tray of tobacco seedlings with streak of plants injured by excessive amount of mancozeb fungicide settled in spray tank. |
| 5368503 |
fungicides |
|
Injured plants are stunted and have yellowed leaves. Some crusty patches of fungicide residue can be seen. |
| 5368504 |
fungicides |
|
Injured plants have yellowed leaves. Some crusty patches of fungicide residue can be seen. |
| 5368513 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Plants usually rot a the soilless mix surface and continue to rot until the entire plant dies. |
| 5368514 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Plants usually rot a the soilless mix surface and continue to rot until the entire plant dies. |
| 5368515 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Plants usually rot a the soilless mix surface and continue to rot until the entire plant dies. |
| 5368516 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Plants usually rot at the soilless mix surface and continue to rot until the entire plant dies. |
| 5368517 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Mycelium of the fungus Rhizoctonia solani. |
| 5368518 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
Mycelium of the fungus Rhizoctonia solani. |
| 5368541 |
Sclerotinia rot |
Sclerotinia sclerotiorum |
Collar rot first appears as small, dark green, water-soaked lesions at the base of stems. Clusters of infected transplants will appear and will have a yellow, wilted, and unthrifty appearance. |
| 5368542 |
Sclerotinia rot |
Sclerotinia sclerotiorum |
Signs of the fungus are found normally at the base of plants or on debris in float trays and include a white, cottony mycelium (fungal mass), present if humidity is high, and irregularly shaped, black sclerotia. Sclerotia resemble seeds or rodent droppi |
| 5368543 |
Sclerotinia rot |
Sclerotinia sclerotiorum |
Plants can be rotted in half by complete rotting of a portion of the lower stem. |
| 5368544 |
Sclerotinia rot |
Sclerotinia sclerotiorum |
Lower stem of an infected plants which severely rotted. |
| 5368567 |
fungicides |
|
High concentration of the fungicide (Terrazole) applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368568 |
fungicides |
|
High concentration of the fungicide (Terrazole) applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368569 |
fungicides |
|
High concentration of the fungicide (Terrazole) applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368570 |
fungicides |
|
High concentration of the fungicide (Terrazole) applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368582 |
herbicides (general) |
|
Symptoms appear first on young growing leaves, but due to the persistence of the compound, it will continue to affect the new bud leaves. `Picloram' residues may persist in the soil and cause damage to tobacco for periods of three or more years after appl |
| 5368583 |
herbicides (general) |
|
Symptoms appear first on young growing leaves, but due to the persistence of the compound, it will continue to affect the new bud leaves. `Picloram' residues may persist in the soil and cause damage to tobacco for periods of three or more years after appl |
| 5368584 |
herbicides (general) |
|
Symptoms appear first on young growing leaves, but due to the persistence of the compound, it will continue to affect the new bud leaves. `Picloram' residues may persist in the soil and cause damage to tobacco for periods of three or more years after appl |
| 5368585 |
herbicides (general) |
|
Symptoms appear first on young growing leaves, but due to the persistence of the compound, it will continue to affect the new bud leaves. `Picloram' residues may persist in the soil and cause damage to tobacco for periods of three or more years after appl |
| 5368590 |
fungicides |
|
High concentration of the fungicide Terrazole applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368591 |
fungicides |
|
High concentration of the fungicide Terrazole applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368592 |
fungicides |
|
High concentration of the fungicide Terrazole applied to floatbed water. Causes tissue at base of leaves and at times up the midrib to bleach white. |
| 5368670 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359 |
| 5368671 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359 |
| 5368672 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359 |
| 5368673 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359 |
| 5368674 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark variety VA 359 |
| 5368675 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco. |
| 5368676 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco. |
| 5368677 |
Phytophthora blight |
Phytophthora nicotianae |
Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco. |
| 5368767 |
herbicides (general) |
|
The main symptom is the producion of heart-shaped leaves. In this case we believed this was a sprayer contamination issue. Acetamide injury |
| 5368768 |
herbicides (general) |
|
The main symptom is the producion of heart-shaped leaves. In this case we believed this was a sprayer contamination issue. Acetamide injury |
| 5368769 |
herbicides (general) |
|
The main symptom is the producion of heart-shaped leaves. In this case we believed this was a sprayer contamination issue. Acetamide injury |
| 5368770 |
herbicides (general) |
|
The main symptom is the producion of heart-shaped leaves. In this case we believed this was a sprayer contamination issue. Acetamide injury. |
| 5368771 |
herbicides (general) |
|
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5368772 |
herbicides (general) |
|
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5368773 |
herbicides (general) |
|
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5368774 |
herbicides (general) |
|
The leaves show two primary symptoms:1- areas or blotches of necrotic tissue that is due to splashing of “Spartan” up onto the leaf. It is associated with highrates of the herbicide (or overlapping), wet prone soils, and/or a heavy rain preceding the onset of symptoms by a few days. These symptoms are usually seenon the older leaves and little or no symptoms on the younger ones. The plants will usually grow out of the injury sustained earlier in the season. Plants taking up enough herbicide to cause injury later in the season will be stunted and the leaves that are injured are not marketable. |
| 5368861 |
weather fleck |
|
Dark tobacco. Note "ring spot" on the leaves. This “ring spot” (also known as "star and crescent spot") which has the form of a necrotic spot encircled by alternating rings of healthy and injured tissue, with the necrotic rings being partial rings or broken lines, is described in an Agronomy Journal of 1971 as physiological in cause (not being caused by a pathogen, air pollutant, nutrient, or chemical). The book "Diseases of Tobacco" 3rd edition, puts this "ring spot" and the reference that says it is not caused by an air pollutant, under the category of weather flecking.We have sent similar samples in the past to a private laboratory for a tobacco virus screen and they have always come back with negative results. |
| 5368862 |
weather fleck |
|
Dark tobacco. Note "ring spot" on the leaves. This “ring spot” (also known as "star and crescent spot") which has the form of a necrotic spot encircled by alternating rings of healthy and injured tissue, with the necrotic rings being partial rings or broken lines, is described in an Agronomy Journal of 1971 as physiological in cause (not being caused by a pathogen, air pollutant, nutrient, or chemical). The book "Diseases of Tobacco" 3rd edition, puts this "ring spot" and the reference that says it is not caused by an air pollutant, under the category of weather flecking.We have sent similar samples in the past to a private laboratory for a tobacco virus screen and they have always come back with negative results. |
| 5368864 |
weather fleck |
|
Dark tobacco. Note "ring spot" on the leaves. This “ring spot” (also known as "star and crescent spot") which has the form of a necrotic spot encircled by alternating rings of healthy and injured tissue, with the necrotic rings being partial rings or broken lines, is described in an Agronomy Journal of 1971 as physiological in cause (not being caused by a pathogen, air pollutant, nutrient, or chemical). The book "Diseases of Tobacco" 3rd edition, puts this "ring spot" and the reference that says it is not caused by an air pollutant, under the category of weather flecking.We have sent similar samples in the past to a private laboratory for a tobacco virus screen and they have always come back with negative results. |
| 5368894 |
frenching |
|
Burley plant on left characteristically showing much more yellowing than Dark tobacco plant seen on right; both show symptoms of Frenching. |
| 5368914 |
weather fleck |
|
The spots usually start as small dark green water-soaked areas. Within 48 hours, the lesions change to a brown color then to a gray or white and appear as sunken necrotic areas bordered by chlorotic tissue (on dark tobacco you usually do not see any yellow halo). The spots are often concentrated along the side of the midrib and large secondary veins but can be found anywhere on the leaf. On expanding leaves the spots appear near the tip. Lower leaf surfaces may show no evidence of damage in the early stages. Lesions may run together causing the leaf surface to become necrotic and fall out. Symptoms may occur at any growth stage, but most commonly occur during periods of rapid growth. Older leaves are more susceptible. Dark fired types usually show less injury than burley types when at the same growth stage and exposed to the same level of ozone. |
| 5368915 |
weather fleck |
|
The spots usually start as small dark green water-soaked areas. Within 48 hours, the lesions change to a brown color then to a gray or white and appear as sunken necrotic areas bordered by chlorotic tissue (on dark tobacco you usually do not see any yellow halo). The spots are often concentrated along the side of the midrib and large secondary veins but can be found anywhere on the leaf. On expanding leaves the spots appear near the tip. Lower leaf surfaces may show no evidence of damage in the early stages. Lesions may run together causing the leaf surface to become necrotic and fall out. Symptoms may occur at any growth stage, but most commonly occur during periods of rapid growth. Older leaves are more susceptible. Dark fired types usually show less injury than burley types when at the same growth stage and exposed to the same level of ozone. |
| 5368916 |
weather fleck |
|
The spots usually start as small dark green water-soaked areas. Within 48 hours, the lesions change to a brown color then to a gray or white and appear as sunken necrotic areas bordered by chlorotic tissue (on dark tobacco you usually do not see any yellow halo). The spots are often concentrated along the side of the midrib and large secondary veins but can be found anywhere on the leaf. On expanding leaves the spots appear near the tip. Lower leaf surfaces may show no evidence of damage in the early stages. Lesions may run together causing the leaf surface to become necrotic and fall out. Symptoms may occur at any growth stage, but most commonly occur during periods of rapid growth. Older leaves are more susceptible. Dark fired types usually show less injury than burley types when at the same growth stage and exposed to the same level of ozone. |
| 5368917 |
weather fleck |
|
The spots usually start as small dark green water-soaked areas. Within 48 hours, the lesions change to a brown color then to a gray or white and appear as sunken necrotic areas bordered by chlorotic tissue (on dark tobacco you usually do not see any yellow halo). The spots are often concentrated along the side of the midrib and large secondary veins but can be found anywhere on the leaf. On expanding leaves the spots appear near the tip. Lower leaf surfaces may show no evidence of damage in the early stages. Lesions may run together causing the leaf surface to become necrotic and fall out. Symptoms may occur at any growth stage, but most commonly occur during periods of rapid growth. Older leaves are more susceptible. Dark fired types usually show less injury than burley types when at the same growth stage and exposed to the same level of ozone. |
| 5368922 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Dark tobacco leaf with symptoms of TSWV. |
| 5368923 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Dark tobacco stem with symptoms of TSWV. |
| 5368924 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Dark tobacco leaf with symptoms of TSWV. |
| 5368925 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Dark tobacco stem with symptoms of TSWV. |
| 5368953 |
fertilization |
|
a 10x rate of fertilizer had been used and likely caused the yellowing and necrosis of the older leaves and along the margins of the younger leaves. Dark variety VA 359. |
| 5368954 |
fertilization |
|
a 10x rate of fertilizer had been used and likely caused the yellowing and necrosis of the older leaves and along the margins of the younger leaves. Dark variety VA 359. |
| 5368955 |
fertilization |
|
a 10x rate of fertilizer had been used and likely caused the yellowing and necrosis of the older leaves and along the margins of the younger leaves. Dark variety VA 359. |
| 5368956 |
fertilization |
|
a 10x rate of fertilizer had been used and likely caused the yellowing and necrosis of the older leaves and along the margins of the younger leaves. Dark variety VA 359. |
| 5369011 |
Pythium diseases |
Pythium spp. |
oospores in root tissue. Narrowleaf Madole |
| 5369012 |
Pythium diseases |
Pythium spp. |
oospores in root tissue. Narrowleaf Madole |
| 5369013 |
Pythium diseases |
Pythium spp. |
oospores in root tissue. Narrowleaf Madole |
| 5369014 |
Pythium diseases |
Pythium spp. |
oospores in root tissue. Narrowleaf Madole |
| 1440134 |
Braconid wasp |
Cotesia congregata |
The braconid wasp is an important parasite of the tobacco hornworm. The larval stage is a small, white legless grub that develops inside the hornworm. Parasitized hornworms are easily recognized after the wasp larvae spin their white football-shaped cocoons. When the parasite becomes an adult, it leaves through an opening in the end of the cocoon and searches for other hornworms. By late summer 90% or more of the hornworm found on tobacco may be parasitized. Hornworms with cocoons may live for several days but do not feed. Insecticides should not be applied if parasitized hornworms are abundant in the field. |
| 5368651 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368652 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368653 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368654 |
Fusarium wilt |
Fusarium oxysporum f.sp. nicotianae |
A one-sided yellowing when looking at the whole plant, an individual leaf, or both. Vascular disoloration is also seen. Variety KT 204. |
| 5368662 |
blue mold |
Peronospora tabacina |
Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants. Variety TN 86 |
| 5368663 |
blue mold |
Peronospora tabacina |
Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants.Variety TN 86 |
| 5368665 |
blue mold |
Peronospora tabacina |
Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants |
| 5368693 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plants with none or minimal leaf symptoms, but severe stem symptoms |
| 5368694 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant with stem symptom with alternating rings of light and dark tissue |
| 5368695 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant with stem symptom with alternating rings of light and dark tissue |
| 5368696 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant with stem symptom with alternating rings of light and dark tissue |
| 5368703 |
Phytophthora blight |
Phytophthora nicotianae |
Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8 |
| 5368704 |
Phytophthora blight |
Phytophthora nicotianae |
Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8 |
| 5368706 |
Phytophthora blight |
Phytophthora nicotianae |
Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8 |
| 5368734 |
lightning |
|
Lightning injury. Plant on left with characteristic white disking of pith. Plant on right has a leaf with early symptoms of Tomato spotted wilt virus infection. |
| 5368812 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant showing leaf symptoms. |
| 5368813 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant showing leaf symptoms. |
| 5368814 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
small burley plant showing leaf symptoms. |
| 5368823 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
Characterized by chlorotic line patterns somewhat similar to the symptoms of tobacco ringspot virus, but with severe symptoms causing younger leaves to appear nearly white with puckering of tissue between the veins. |
| 5368824 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
Characterized by chlorotic line patterns somewhat similar to the symptoms of tobacco ringspot virus, but with severe symptoms causing younger leaves to appear nearly white with puckering of tissue between the veins. |
| 5368825 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
Characterized by chlorotic line patterns somewhat similar to the symptoms of tobacco ringspot virus, but with severe symptoms causing younger leaves to appear nearly white with puckering of tissue between the veins. |
| 5368826 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
Characterized by chlorotic line patterns somewhat similar to the symptoms of tobacco ringspot virus, but with severe symptoms causing younger leaves to appear nearly white with puckering of tissue between the veins. |
| 5368879 |
Pythium diseases |
Pythium spp. |
filamentous and one terminal sporangia. Tennessee 90 |
| 5368880 |
Pythium diseases |
Pythium spp. |
filamentous and one terminal sporangia with zoospores (round structure at bottom right). Tennessee 90 |
| 5368881 |
Pythium diseases |
Pythium spp. |
filamentous sporangia. Tennessee 90 |
| 5368882 |
Pythium diseases |
Pythium spp. |
zoospores releasing from a terminal sporangium. Tennessee 90 |
| 5368895 |
blue mold |
Peronospora tabacina |
Lower leaf surface with moldy growth on the fungus. Hybrid 403. |
| 5368896 |
blue mold |
Peronospora tabacina |
Spots on upper leaf surface beginning to become necrotic with slight yellow halo. Hybrid 403. |
| 5368897 |
blue mold |
Peronospora tabacina |
Yellow to necrotic spots on upper leaf surface with faint yellow halo. Hybrid 403. |
| 5368898 |
blue mold |
Peronospora tabacina |
Moldy growth of fungus on lower leaf surface. Hybrid 403. |
| 5368893 |
frenching |
|
Top portion of a burley tobacco plant with symptoms of Frenching. |
| 5368899 |
frenching |
|
Close-up of Frenching symptoms on a Dark tobacco plant; burley plant with Frenching symptoms at far left. |
| 5368909 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Close-up of one leaf of older burley plant |
| 5368910 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
older burley plant with leaf symptoms |
| 5368911 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
Ringspots and the characteristic "oak leaf" pattern is evident on leaf. |
| 5368912 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
Small areas of the characteristic "oak leaf" pattern are evident on leaf. |
| 5368913 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
Symptoms not well pronounded. |
| 5368918 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Older burley plant with leaf and stem symptoms of TSWV. |
| 5368919 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Older burley plant with leaf and stem symptoms of TSWV. |
| 5368920 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Older burley plant with leaf and stem symptoms of TSWV. |
| 5368921 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
Older burley plant with leaf and stem symptoms of TSWV. |
| 5369024 |
charcoal rot |
Macrophomina phaseolina |
Many survival structures of the fungus called "microsclerotia". |
| 5369029 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. |
| 5369030 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. |
| 5369031 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. |
| 5369032 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
When the fungus first infects the leaf, it produces a dark green spot. As the infection process continues,the spots turn papery thin and can drop out. Spots can also enlarge and have a bull's eye look to them. |
| 5332058 |
Rhizoctonia damping-off, blight and rot |
Rhizoctonia solani |
|
| 5332062 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
|
| 5332063 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
|
| 5332064 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
|
| 5332071 |
manganese toxicity |
|
|
| 5332072 |
manganese toxicity |
|
|
| 5332065 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
|
| 5332066 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
|
| 5332067 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
|
| 5332068 |
Tobacco Vein Mottling Virus |
Potyvirus TVMV |
|
| 5332069 |
Tobacco Ringspot Virus |
Nepovirus TRSV |
|
| 5332073 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
|
| 5332074 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
|
| 5332075 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
|
| 5332076 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
|
| 5332077 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
|
| 5373952 |
Alfalfa Mosaic Virus |
Alfamovirus AMV |
|
| 5373352 |
Phytophthora blight |
Phytophthora nicotianae |
|
| 5373353 |
Phytophthora blight |
Phytophthora nicotianae |
|
| 0746035 |
tobacco budworm |
Heliothis virescens |
Differentiation of larva by the form of thorns on larval skin: larval skin of Heliothis virescens (13th body segment). |
| 5266030 |
Tobacco Etch Virus |
Potyvirus TEV |
nuclear inclusion |
| 5363828 |
tobacco |
Nicotiana spp. |
Tobacco seeds during a seed quality inspection exercise. |
| 1524174 |
Tomato Spotted Wilt Virus |
Tospovirus TSWV |
|
| 1497005 |
bacterial hollow stalk |
Erwinia aroideae |
tobacco-hollow stalk |
| 1497006 |
bacterial hollow stalk |
Erwinia aroideae |
Hollow stalk on tobacco |
| 1497007 |
bacterial hollow stalk |
Erwinia aroideae |
tobacco hollow stalk |
| 1497008 |
bacterial hollow stalk |
Erwinia aroideae |
Tobacco hollow stalk |
| 1497011 |
Phytophthora blight |
Phytophthora nicotianae |
Phytophthora parasitica var. nicotianae; Tobacco black shank |
| 1497014 |
Phytophthora blight |
Phytophthora nicotianae |
Black shank on tobacco |
| 1497016 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; tobacco blue mold |
| 1497017 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; Tobacco blue mold |
| 1497018 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; Tobacco blue mold |
| 1497019 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; Tobacco blue mold |
| 1497020 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; Tobacco blue mold |
| 1497022 |
blue mold |
Peronospora tabacina |
Peronospora tabacina; Tobacco blue mold |
| 1497032 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
Tobacco TMV |
| 1497034 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
Tobacco TMV |
| 1497035 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
Tobacco TMV |
| 1497036 |
Potato Virus Y |
Potyvirus PVY |
PVY(Potato Virus Y)on Tobacco |
| 1497039 |
lightning |
|
Tobacco lightning damage |
| 1497045 |
weather fleck |
|
Weather fleak on tobacco |
| 1497048 |
sunscald |
|
Sunscald on Tobacco |
| 1497049 |
tobacco budworm |
Heliothis virescens |
Bud worm damage on tobacco |
| 1497057 |
sunscald |
|
Sun Scald on tobacco |
| 1497059 |
Phytophthora blight |
Phytophthora nicotianae |
Black shank on tobacco |
| 1497060 |
wildfire of tobacco |
Pseudomonas syringae pv. tabaci |
Angular leaf spot |
| 5260084 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5260085 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
|
| 5260086 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5260087 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5260088 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5260090 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5259091 |
Peanut Stunt Virus |
Cucumovirus PSV |
|
| 5259097 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
|
| 5259098 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
|
| 5259099 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
|
| 5260043 |
Tobacco Mosaic Virus |
Tobamovirus TMV |
inclusion bodies |
| 5257022 |
blue mold |
Peronospora tabacina |
|
| 5266028 |
Tobacco Etch Virus |
Potyvirus TEV |
inclusion body |
| 5266029 |
Tobacco Etch Virus |
Potyvirus TEV |
inclusion body |
| 5266031 |
Tobacco Etch Virus |
Potyvirus TEV |
Nuclear inclusion bodies |
| 5266032 |
Tobacco Etch Virus |
Potyvirus TEV |
|
| 5266051 |
Tobacco Etch Virus |
Potyvirus TEV |
inclusion body |
