herbicides (general) (  ) on flue-cured tobacco (Nicotiana tabacum (flue-cured type)) - 1402075

herbicides (general)

Host: flue-cured tobacco (Nicotiana tabacum (flue-cured type) L.)
Descriptor: Damage
Description: Triazines are a group of herbicides which include atrazine, cyanazine, propazine, ametryn, prometryn, simazine, and metribuzin. Substituted ureas are a group of herbicides which include linuron, diuron, fluometuron, and chloroxuron. Both triazines and ureas produce similar injury symptoms. Injury can be caused by foliar or root uptake. Mild symptoms from low levels first appear on the tips of older leaves as yellowing between the veins. As the injury increases, the areas between the veins turn brown and progress toward the base of the leaf. The leaves will die back from the tips and edges. Plants will be stunted but may survive from very low levels; however, plant death will occur from high levels. Foliar exposure can kill the plant; however, with low levels, yellow to white areas are formed, turn brown, and fall out. Ureas may produce a brighter yellow to white leaf mottling than triazines. Symptoms of injury from all herbicides in the triazine and urea groups are very similar and are difficult to separate.
Image type: Field
Image location: United States

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Specimen in collection: No
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Photographer Information

Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States

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Image Number: 1402075

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Image Citation:(?) R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org

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Image uploaded on Sunday, March 10, 2002
Image Information last updated on Thursday, July 21, 2011