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Phytophthora on summer squash fruit

Symptoms of Phytophthora blight in summer squash can progress rapidly from death of the growing tip to total plant collapse and fruit rot. Affected fruit often are covered with spores of Phytophthora capsici (sporangia) which look white and yeasty.
Photo courtesy of M.T. McGrath, Long Island Horticultural Research and Extension Center



Cull fruit can easily become infected by Phytophthora capsici because they are on soil, which is where this pathogen is. Infected cull fruit can be a source of inoculum for Phytophthora blight in the crop, as occurred in this field.
Photo courtesy of M.T. McGrath, Long Island Horticultural Research and Extension Center