Herbicide Symptom Key

Shoot cell division/cell elongation inhibitors resulting in shoot malformation.

Symptoms are stunted plants with twisted shoots and dark green leaves. Seedlings fail to emerge or exhibit poor emergence from the soil. Grasses may fail to emerge from the coleoptile properly or grass leaves may not properly unfurl. Broadleaves may have crinkled or puckered leaves or a shortened midvein, or leaf buds may not open.

Chloroacetamide herbicides - absorbed by emerging shoots, phytotoxic only to emerging seedlings

s-metolachlor – Dual Magnum

Buggy whipping (on corn)

Cotton and Cantaloupe injury and morningglory control at 2x use rate

---

Thiocarbamate herbicides - absorbed by emerging shoots, phytotoxic only to emerging seedlings

butylate – Sutan+
EPTC – Eptam

 

---

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.