Herbicide Symptoms - Part 1 (ACIS)

Lipid biosynthesis inhibitors - inhibit the enzyme acetyl-coenzyme A carboxylase (ACCase) in grasses and stop the synthesis of fatty acids. Since fatty acids are required to produce new cell membranes, plants stop growing and eventually die.

Symptoms - discoloration and disintegration of meristematic tissues, leaf sheaths at the nodes become mushy and brown, leaves turn yellow, sometimes wilt and necrotic symptoms spread over the entire plant

Aryloxyphenoxy propionate herbicides

fluazifop-P-butyl - Fusilade DX
diclofop - Hoelon
fenoxaprop-p - Acclaim

Cyclohexanedione herbicides

Full Disclaimers

Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture, The University of Arizona.

The University of Arizona is an equal opportunity, affirmative action institution. The University does not discriminate on the basis of race, color, religion, sex, national origin, age, disability, veteran status, or sexual orientation in its programs and activities.

Because labels are subject to frequent change, always consult the label attached to the product before using any pesticide. The user must assume responsibility for proper application and for residues on crops as well as for damage or injury caused by pesticides, whether to crop, person or property.

Any products, services, or organizations that are mentioned, shown, or indirectly implied in this web document do not imply endorsement by The University of Arizona.

Erin Taylor, etaylor@cals.arizona.edu Extension Agent, Field & Veg Crops
William B. McCloskey, wmcclosk@ag.arizona.edu Extension Weed Specialist
College of Agriculture, The University of Arizona, Tucson, AZ.
Material written June 2003.