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Field Scouting Guide: Squash Powdery Mildew Updated: June 30, 2021 When scouting pumpkin fields that are being sprayed with a protectant fungicide (i.e. chlorothalonil), keep in mind the fungicide is likely protecting the upper leaf surface, so the typical circular white powdery colonies may appear more chlorotic or yellow in color on the upper surface, but will be powdery white on the corresponding lower leaf surface. Photo by Beth K. Gugino. This edition of Field Scouting Guide covers squash powdery mildew. We reached out to pathologists to learn how to spot and treat powdery mildew. This month, our contributors are Beth K. Gugino, Penn State University, Debra Inglis, Washington State University (retired), and Anthony Keinath, Clemson University.

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