Crops and landscape plants are too often injured by inappropriate use of herbicides. The most common sources of herbicide injury are from off-target movement (spray drift, vapor drift, washing in surface waters), excess doses (due to poor calibration or just sloppy applications), contaminated soil or composts, carry-over residues from previous crops, or just choosing the wrong herbicide for the site / crop. The following information has been compiled to assist you in recognizing and diagnosing herbicide injury when it occurs.
Information and photographs of herbicide injury symptoms on ornamental plants and other horticultural crops
The most important thing to do is to get all the facts before drawing conclusions. Many factors may cause symptoms that mimic herbicide injury.
Wolfpack Weeds provides information on weed management systems for vegetable and fruit crops, and includes information on crop safety, field residues, herbicide development and efficiency, and alternative methods for weed management.
The University of California IPM web site created by Dr. Kassim Al-Khatib contains a searchable database for images of herbicide injury to many crop plants, as well as information about herbicide modes of action, preventing herbicide drift, and diagnosing herbicide injury.