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Phytophthora on summer squash

Phytophthora blight usually starts in summer squash with die back of the growing tip. Symptoms can also begin at the plant crown.
Photo courtesy of M.T. McGrath, Long Island Horticultural Research and Extension Center

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