HERBICIDE INJURY SYMPTOMS
Iowa State – Mode of action key to injury symptoms
Iowa State University – Mode of Action Chart
Purdue University – Injury symptoms on corn and soybeans
Purdue University – Herbicide injury on spruce and pine
Texas A & M University Herbicide injury with pictures– includes additional links regarding drift
University of Arizona – Nutrient deficiency and herbicide injury symptoms in citrus
University of California – Davis – Herbicide injury symptoms
University of Florida Diagnosing herbicide injury
University of Idaho – Symptoms on sugar beets
University of Minnesota – Injury symptoms on barley and spring wheat
University of Missouri – Mode of action families on crops
University of North Carolina – good pictures