Possible Problems of Summer Squash
Symptoms Probable Cause
Meager harvest Few Male Blossoms
Leaves wrinkled or curled; discolored, stunted, tend to fall off Aphids
Holes in leaves Corn Earworms
Holes chewed in leaves, leaf stalk, stems; plant wilts, dies. Cucumber Beetles
Foliage yellowed or white mottling, glaze of honeydew; plant weakens Leafhopper
Leaves skeletonized Mexican Bean Beetle
Wilted; dried-up leaves Squash Bugs
Sudden wilting of plant Squash Vine Borer
Leaves discolored; black fecal spots on underside of leaf. Thrips
Weakened plants; yellow leaves; leaves discolored; covered with honeydew Whitefly
Small, dark spots on leaves; eventually leaves turn black; fruits may blacken and drop Anthracnose, A Fungal Disease
Plants wilt quickly; white, sticky material might be seen when a stem is cut Bacterial Wilt
Gray patches on lower leaves spread upward Downy Mildew, A Fungal Disease
Mottled, crinkled foliage; brown specks appear on fruit, and plants may droop and die prematurely Yellow Mosaic Virus
White spots on leaves; eventually entire leaf is covered with powder Powdery Mildew, A Fungal Disease
