Image Number: 1402044

This fungal disease causes slow yellowing and drying of the leaves. Symptoms are usually more pronounced on one side of the plant. Leaves may not wilt at first, but those on affected sides of the plants are usually stunted. The top of the plant may be drawn toward the diseased side. Wilting eventually occurs and upper leaves have a bronze cast. On the affected side of the plant, wood beneath the outer bark has a uniform chocolate brown discoloration. Such discoloration can also be seen in the midribs of affected leaves and in roots. Some roots on the affected side die. The unilateral appearance of symptoms and vascular discoloration can cause confusion between Fusarium wilt and Granville wilt. However, the "bacterial streaming" described for Granville wilt is a reliable way to distinguish between these two diseases. Fusarium wilt is frequently accompanied by root-knot nematode infection.
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United States


Kingdom: Fungi
Phylum: Ascomycota
Subphylum: Pezizomycotina
Class: Sordariomycetes
Subclass: Hypocreomycetidae
Order: Hypocreales
Family: Nectriaceae
Genus: Fusarium
Subject: Fusarium oxysporum f.sp. nicotianae (Johnson) W.C. Snyder & H.N. Hansen


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
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Image uploaded:
Sunday, March 10, 2002
Image last updated:
Thursday, December 16, 2010