University of Arizona a dot Cooperative Extension

Herbicide Symptoms

by Pat Clay, Kai Umeda and Bill McCloskey

Sulfonylurea herbicides

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

Sandea (halosulfuron) -

  • Red veins (on cotton and alfalfa)

Photo of cotton leaves with red veins and some chlorosis.

Photo of red veins on alfalfa seedlings.

Pyrimidinyl oxybenzoate herbicide

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

Staple (pyrithiobac) -

  • Red veins (cowpea)

Photo of red veins on cowpea.

Aryloxyphenoxy propionate and Cyclohexanedione herbicides grass herbicides
  • Foliar applied
  • Shoot absorbed
  • Rapid uptake and translocation to growing points
  • Selective and only grass weeds

Select (clethodim) -

  • Growing point easy to remove (on corn)

Photo of corn seedling with the growing point pulled out because was necrotic.

  • Purpling of leaf tissue (on grain sorghum)

Photo of purple leaf tissue on grain sorghum.


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