University of Arizona a dot Cooperative Extension

Herbicide Symptoms

by Pat Clay, Kai Umeda and Bill McCloskey

Triazolinone herbicides

  • Foliar and soil applied
  • Readily absorbed by leaves
  • Not translocated
  • Annual broadleaf weeds

Aim (carfentrazone) -

  • Bronzing and necrosis of leaf tissue (on watermelon and cotton)

Photo of watermelon leaves with bronzing and necrotic tissue.

Cotton seedlings with nectotic leaves.

Imidazolinone herbicides

  • Foliar and soil applied
  • Root and shoot absorbed
  • Rapidly translocated to growing points
  • Selective and broadspectrum

Pursuit (imazethapyr) -

  • Buggy whipping (on corn)

Photo of buggy whipping of corn leaves.

  • Stunting (flat top)
  • Purple discoloration (on Johnson grass)

Photo of stunted and purple colored Johnson grass plant.

  • Lime green color (on cotton)
  • Cupping of upper leaves

Photo of cotton plants with lime green and cupped upper leaves.

  • Stacked nodes (on watermelon)

Photo of stacked nodes on a watermelon plant.

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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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