University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Pigment inhibitors

Injury from clomazone on soybeans and corn. Soybeans are generally tolerant; damage to soybeans is unlikely except at high application rates.
Injury from clomazone on soybeans and corn. Soybeans are generally tolerant; damage to soybeans is unlikely except at high application rates. Injury from clomazone on soybeans and corn. Soybeans are generally tolerant; damage to soybeans is unlikely except at high application rates. Injury from clomazone on soybeans and corn. Soybeans are generally tolerant; damage to soybeans is unlikely except at high application rates.
 

Isoxazolidinones chemical group

Herbicides

Mode of action and characteristics of activity

General symptoms

Injury from isoxaflutole on soybeans appears to be similar to atrazine injury except that isoxaflutole causes more chlorosis and some bleaching should eventually be seen.
Injury from isoxaflutole on soybeans appears to be similar to atrazine injury except that isoxaflutole causes more chlorosis and some bleaching should eventually be seen. Injury from isoxaflutole on soybeans appears to be similar to atrazine injury except that isoxaflutole causes more chlorosis and some bleaching should eventually be seen.
 

Injury from isoxaflutole on corn. Note the chlorosis on leaf tips and ends.
Injury from isoxaflutole on corn. Note the chlorosis on leaf tips and ends.
Injury from isoxaflutole on corn. Note the chlorosis on leaf tips and ends.Injury from isoxaflutole on corn. Note the chlorosis on leaf tips and ends.
 

Isoxazoles

Herbicides

Mode of action and characteristics of activity

General symptoms

Injury from postemergence applications of triketone herbicides like mesotrione will appear as irregular chlorosis and bleaching of the lower leaves and whorls. Some sweet corn hybrids are highly sensitive to postemergence triketone herbcides.
Injury from postemergence applications of triketone herbicides like mesotrione will appear as irregular chlorosis and bleaching of the lower leaves and whorls. Some sweet corn hybrids are highly sensitive to postemergence triketone herbcides. Injury from postemergence applications of triketone herbicides like mesotrione will appear as irregular chlorosis and bleaching of the lower leaves and whorls. Some sweet corn hybrids are highly sensitive to postemergence triketone herbcides. Injury from postemergence applications of triketone herbicides like mesotrione will appear as irregular chlorosis and bleaching of the lower leaves and whorls. Some sweet corn hybrids are highly sensitive to postemergence triketone herbcides.
 

Injury from residual activity of triketone herbicides like mesotrione will also appear similar to isoxaflutole and atrazine injury with initial chlorosis of the first true leaves and trifoliates, but some signs of bleaching should eventually appear.
Injury from residual activity of triketone herbicides like mesotrione will also appear similar to isoxaflutole and atrazine injury with initial chlorosis of the first true leaves and trifoliates, but some signs of bleaching should eventually appear.
Injury from residual activity of triketone herbicides like mesotrione will also appear similar to isoxaflutole and atrazine injury with initial chlorosis of the first true leaves and trifoliates, but some signs of bleaching should eventually appear.Injury from residual activity of triketone herbicides like mesotrione will also appear similar to isoxaflutole and atrazine injury with initial chlorosis of the first true leaves and trifoliates, but some signs of bleaching should eventually appear.
 

Soybean injury can occur as a result of mesotrione or topramezone carryover. This will appear as partially bleached trifoliates with some degree of leaf strapping.
Soybean injury can occur as a result of mesotrione or topramezone carryover. This will appear as partially bleached trifoliates with some degree of leaf strapping.
Soybean injury can occur as a result of mesotrione or topramezone carryover. This will appear as partially bleached trifoliates with some degree of leaf strapping.Soybean injury can occur as a result of mesotrione or topramezone carryover. This will appear as partially bleached trifoliates with some degree of leaf strapping.
 

Mesotrione injury on other vegetable plants will also appear as bleaching, especially toward the outer leaf edges.
Mesotrione injury on other vegetable plants will also appear as bleaching, especially toward the outer leaf edges.Mesotrione injury on other vegetable plants will also appear as bleaching, especially toward the outer leaf edges.
 

Injury from drift of triketone herbicides like mesotrione on soybean plants ranges from slight bleaching of the leaf margins to severe chlorosis and bleaching of the newest trifoliates, depending on the severity of drift or contact with the foliage.
Injury from drift of triketone herbicides like mesotrione on soybean plants ranges from slight bleaching of the leaf margins to severe chlorosis and bleaching of the newest trifoliates, depending on the severity of drift or contact with the foliage.Injury from drift of triketone herbicides like mesotrione on soybean plants ranges from slight bleaching of the leaf margins to severe chlorosis and bleaching of the newest trifoliates, depending on the severity of drift or contact with the foliage.
Injury from drift of triketone herbicides like mesotrione on soybean plants ranges from slight bleaching of the leaf margins to severe chlorosis and bleaching of the newest trifoliates, depending on the severity of drift or contact with the foliage.

Triketones chemical group

Herbicides

Mode of action and characteristics of activity

General symptoms

IPM1007, revised November 2009

IPM1007 Practical Weed Science for the Field Scout: Corn and Soybean | University of Missouri Extension

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