Image Number: 1440080

Tobacco is extremely sensitive to picloram and very small amounts from drift, contaminated equipment, or residue in the soil will cause serious injury. The most common symptom is a downward curling of the margins and tips of the leaf. The curl of the tip results in "parrott beak" or hooded appearance. Symptoms appear first on young growing leaves, but due to the persistence of the compound, it will continue to affect the new bud leaves. New leaves may take on a heart-shaped appearance as the midrib is stunted, while the adjoining tissue continues to grow. Higher rates of picloram result in thick, strappy, elongated older leaves and elongated or aborted bud leaves. Young leaves may also have a wide thick midrib with little or no adjoining leaf tissue. Picloram residues may persist in the soil and cause damage to tobacco for periods of three or more years after application.
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Image location:
United States


Kingdom: Agrochemicals
Phylum: Herbicides
Class: Conventional Herbicides
Order: General herbicides
Family: General Herbicides
Subject: herbicides (general)


Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (burley type) L.
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Image uploaded:
Monday, January 1, 1990
Image last updated:
Wednesday, September 1, 2010