Herbicide Damage to Vegetable Plants
By Nebraska Extension Horticulture Educator Kathleen Cue, Dodge County
Twisting, curling, and cupping of leaves are often symptomatic of herbicide damage on vegetable plants. The culprits that most readily cause this type of damage include 2,4-D (used to kill broadleaf weeds in lawns and pastures), dicamba (lawn and crop broadleaf weeds) and picloram (pasture broadleaf weeds). These herbicides are plant growth regulators, killing weeds by stimulating excessive growth and exhausting the plant’s carbohydrate reserves. When vegetable plants are exposed to smaller amounts of these herbicides, then distortion of growth results.