Determining the Sensitivity of Early Cercospora Arachidicola and Late Cerosporidium Personatum Leaf Spot to the Strobilurin Fungicides Pyraclostrobin and Azoxystrobin


University of Florida

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Southeast (GA, FL, AL)

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In recent years, the efficacy of sterol fungicides (i.e. tebuconazole) to control peanut leaf spot diseases has decreased, which has led costly adjustments in many peanut spray management programs. Often the over use of a fungicide in disease management programs can lead to this reduction in product efficacy. An increase in the use of the leaf spot fungicides azoxystrobin (Abound) and pyraclostrobin (Headline) is expected as the patents expire on these fungicides in the next couple of years. Resistance has already been observed to strobilurin fungicides for the soybean pathogen Cercospora sojina, which is from the same fungal genus as early and late leaf spot. Developing baseline sensitivity for these fungicides to early and late leaf spot will be critical for maintaining and monitoring the utility of these "at-risk" fungicides in the future. 

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