University of Arizona a dot Cooperative Extension

Herbicide Symptoms

by Pat Clay, Kai Umeda and Bill McCloskey

Bipyridilium herbicides

  • Foliar applied
  • Rapid burndown activity
  • Non-selective grass and broadleaf weeds

Gramoxone Max (paraquat) -

  • Rapid desiccation of leaf tissue (on purslane)

Photo of desiccated purslane plants.

  • Leaf tip burn (on corn)
  • Necrotic lesions

Photo of a corn plant with tip burn and necrotic lesions.

  • Necrotic spots with red halo (on cotton)

Photo of cotton plant with necrotic spots on the leaves.

Diphenylether herbicides

Goal (oxyfluorfen) -

  • Bronzing of contacted leaf tissue (on cotton)

Photo of cotton leaves with bronzing.

Photo of bronzing on cantaloupes.

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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, Extension Agent, Field & Veg Crops
Kai Umeda, Area Extension Agent, Vegetable Crops
William B. McCloskey, Extension Weed Specialist
College of Agriculture, The University of Arizona, Tucson, AZ.
Material written September 2002.

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Copyright © 2001 University of Arizona,
College of Agriculture and Life Sciences