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The G143A Mutation is Responsible for Strobilurin Fungicide Resistance in Cercospora cf. flagellaris, a Leaf Blight and Purple Seed Stain Pathogen of Louisiana Soybean

S. Albu, T. Price, V. Doyle, B. Padgett, and R. Schneider

September 2016


Cercospora leaf blight and purple seed stain are economically important diseases of soybean throughout the Lower Mississippi River Valley and Gulf South USA. Fungicide resistance was documented in Louisiana in the pathogen population using radial growth assays. Using some of the same isolates, a portion of the cytochrome b gene was sequenced. The G143A mutation was found in resistant isolates, and results correlated with radial growth assays 97% of the time.


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