Herbicide Damage: 2,4-D and triclopyr

Photo by: R.S. Byther
Use IPM (Integrated Pest Management) for successful plant problem management.

Biology
2,4-D and triclopyr are hormone-type herbicides used to control annual and perennial broadleaf weeds. These products are translocated throughout the plant in both xylem and phloem. They mimic natural hormones in plants and primarily cause symptoms on new growth. Damage may appear as distorted plant parts including cupped leaves, strap-like leaves, and twisted new growth. Severity of damage most commonly depends on amount applied, species of plant, stage of growth, and if other herbicides are present in the mixture. Damage also may occur from drift of the pesticide or pesticide vapors. Eruptions or blisters of dead tissue may result from 2,4-D on London plane tree. Some grasses may also be sensitive to damage. Triclopyr can persist in the soil for most of the growing season or from one growing season to the next.

Management Options

Select Non-chemical Management Options as Your First Choice!!
Revision Date:5/1/2013
Carefully read all label instructions prior to using products containing 2,4-D and/or triclopyr.

Hortsense web site created by Carrie Foss, Pesticide Education, and Art Antonelli, Extension Entomology, WSU Puyallup
Pesticide information review provided by Catherine Daniels, Washington State Pest Management Resource Service
Database programs developed for Hortsense by Kathleen Duncan, Computer Resources, WSU Pullman
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