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Symptoms of viruses on summer squash fruit


Mosaic and rugosity of foliage and color breaking on fruit of straightneck yellow squash caused by Watermelon Mosaic Potyvirus (formerly WMV-2).

Note mosaic on foliage but absence of color breaking on fruit infected with Watermelon Mosaic Potyvirus (formerly WMV-2). Presence of a yellow precocious gene in the variety 'Multipik' and other varieties prevents color breaking from occurring.
Photos courtesy of T.A. Zitter, Cornell University, Ithaca, NY


Color breaking on yellow straightneck summer squash caused by Papaya Ringspot Potyvirus
Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

Zucchini summer squash fruit showing malformed and knobby appearance caused by infection with Papaya Ringspot Potyvirus
Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

PRSV on summer squash. Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY