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First Detection of Boscalid Resistance in Podosphaera xanthii in the United States Associated With Failure to Control Cucurbit Powdery Mildew in New York and New Jersey in 2009

M. T. McGrath and C. A. Wyenandt

May 2017


The most effective management tool for powdery mildew on cucurbit crops is mobile, targeted fungicides having a moderate or high resistance risk and the causal pathogen has proven to be a high-risk organism. Information about occurrence of resistance to a new chemical group and impact on resistance management is important for guiding fungicide programs and contributing to scientific knowledge about resistance development. This brief reports the first known occurrence of resistance to a succinate dehydrogenase inhibitor fungicide in Podosphaera xanthii in the United States.


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