When did the herbicide injury appear?
What are the symptoms?
Is the herbicide specific to broadleaf or grass plants?
What do the individual leaves look like?
Grass leaves tightly roll, also known as onion leafing. Broadleaves exhibit leaf cupping and strapping. The stems of both grasses and broadleaves exhibit may twist, also known as epinasty.– Growth Regulators
Grass meristems rot and are easily pulled from the whorl, broadleaves are not affected.– ACCase Inhibitors
Soybean leaves develop reddish veins and have shortened internodes. Corn plants have shortened internodes (stacking), a yellow flash may develop in the whorl, the leaves become crinkled, and the ears may develop a pinched appearance.– ALS Inhibitors