Abstract

In the mid-Atlantic and Northeast regions of the United States, more than 163,000 acres of fresh-market vegetable crops are grown annually. Two important diseases of cucurbit crops across the Unites States and world are powdery mildew caused by Podosphaera xanthii (formerly Sphaerotheca fuliginea [Schlecht ex Fr.] Poll.) and downy mildew caused by Pseudoperonospora cubensis. Resistance to a number of high-risk fungicides has been detected in both pathogens. To help cucurbit growers in the mid-Atlantic and Northeast regions properly manage both diseases, an updated fungicide resistance management table has been developed to promote the importance of understanding Fungicide Resistance Action Committee (FRAC) codes. This table provides a tool to allow cucurbit growers to develop season-long cucurbit downy and powdery mildew control programs.

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