Plant Pathology Department


Date of this Version



Chapter in 2017 Crop Production Clinic Proceedings, University of Nebraska-Lincoln Extension, Institute of Agriculture and Natural Resources, pp. 185–188.


Copyright © 2017 The Board of Regents of the University of Nebraska.


Fungicide resistance has developed in some diseases of row crops as well as specialty crops. This implies that fungicide applications to control such diseases may no longer be effective. Scientific studies have shown that fungicide resistance develops through natural selection of a mutant strain of a pathogen in a population that is resistant to fungicides. Resistance is very difficult to eliminate but can be delayed through appropriate management practices. The availability of inexpensive options with single mode of action products being available makes this an important issue so we do not repeat what was done in weed management.


Frogeye Leaf Spot of Soybean

General Management of Frogeye Leaf Spot … Resistance … Cultural Practice … Fungicide Application

Gray Leaf Spot of Corn

Management of Gray Leaf Spot … Hybrid resistance … Cultural practices … Fungicides … Integrated management

Fusarium Head Blight of Wheat

Management of FHB … Cultivar Selection ... Cultural practices … Fungicides … Biological control … Integrated Management

Asochyta Blight of Chickpea

Management of Asochyta Blight … Resistance … Cultural … Chemical

Risk Factors for Development of Fungicide Resistance

Management Recommendations

Additional Resources