Understanding Fungicide Resistance

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. Introduction 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 Resource