Squash Diseases

Melanie Lewis Ivey, Hadziabdic, Denita, Hollier, Clayton A., Ferrin, Donald M., Overstreet, Charles  | 6/13/2005 6:35:49 PM

Squash scab on leaves and fruit. This disease is caused by the fungus Cladosporium cucumerinum. Lesions on the leaves are necrotic with a yellowish halo, and may resemble "shot-hole" in appearance in advanced stages. Fruit spots initially appear as small, sunken areas that eventually affect the entire fruit.

Butternut squash (Cucurbita moschata) with reddish-brown and whitish lesions of early stages of black rot, caused by the fungus Didymella bryoniae. Image courtesy of T.A. Zitter, Cornell University.

Extensive black rot infection on spaghetti squash. The symptoms in the field often occur on the side of the fruit that is in contact with soil, particularly during periods of moderate temperatures and high moisture levels. Image courtesy of T.A. Zitter, Cornell University.

Watermelon mosaic virus (WMV-2) damage on fruit. This virus is transmitted by aphids.

Advanced symptoms of black rot on butternut squash. Black rot refers to the fruit rot phase of gummy stem blight, which is caused by by two fungi, Didymella bryoniae (sexual stage) and Phoma cucurbitacearum (asexual stage). Image courtesy of T.A. Zitter, Cornell University.

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