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Powdery mildew on summer squash leaves

Whitened leaves of summer squash variety with heavy powdery mildew colonization.Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

Demonstration of genetic resistance to powdery mildew in pumpkin and winter squash lines developed at Cornell University. Susceptible material in foreground.
Photo courtesy of M. K. Jahn, Dept. of Plant Breeding, Cornell University, Ithaca, NY