1 of 9. Basic requirements Squash is a warm-season crop, requiring lots of sun and good drainage to develop optimally and growing best at temperatures between 18 and 25°C (65–75°F). Skip to Left navigation Skip to Main content Skip to Footer, Extension > Garden > Diagnose a problem > What's wrong with my plant? Meager harvest          Few Male Blossoms, Leaves wrinkled or curled; discolored, stunted, tend to fall off          Aphids, Holes chewed in leaves, leaf stalk, stems; plant wilts, dies. Powdery Mildew Podosphaera xanthii. Leaves wrinkled or curled; discolored, stunted, tend to fall off Aphids. Initially pale yellow spots develop on the oldest leaves; White to gray powdery felt in spots, blotches or complete covering of leaves; Lesions develop on underside of leaves, or on shaded leaves first;
Powdery Mildew Podosphaera xanthii. > Vegetable > Summer Squash and Zucchini > Discolored leaves, Squash mosaic, cucumber mosaic, watermelon mosaic, Commercial Fruit and Vegetable Production, Regional Sustainable Development Partnerships, Fish, Wildlife, and Conservation Education, Initially pale yellow spots develop on the oldest leaves, White to gray powdery felt in spots, blotches or complete covering of leaves, Lesions develop on underside of leaves, or on shaded leaves first, Severe infection can cause leaves and vines to wither and die, Weather has been cold (below 50°F) and wet, Soil is cold (below 62°F) and damp to the touch, In severe cases entire leaves, young shoots or the entire plant may be completely discolored and wilted, Adults are 5/8 inch long, somewhat flattened, and gray to dark brown with alternating orange and brown stripes on the edges of their abdomen, Nymphs are 1/10 to 1/2 inch and are a light to dark gray color, Irregular, blotchy to wavy patterns of yellows and greens on leaves, Leaves may be distorted (sometimes fern-like), wrinkled, and curled, Fruit may have unusual color patterns, blotches or rings but are not rotten, Feeding by larvae causes yellowing of leaves and wilting, Holes filled with green to orange excrement near the base of the plant may be present, Common on summer and winter squash and pumpkins, Adult borer resembles a wasp, is active mid-June through July, Leaves first appear dull green, wilt during the day, and recover at night, Wilt progresses down the vine until entire vine is wilted or killed, Striped or spotted cucumber beetles will be present in the garden, Cucumbers and muskmelon most commonly affected (pumpkins and squash less affected), Feeding on the underside of leaves causes leaves to appear pale and stippled, Webbing can be found on underside of leaves when heavy infestations are present, Adult spider mites are very small (approximately 1/50 inch in length), and are yellow to dark crimson, with dark spots, Mites usually appear in late June and August, and are more prevalent in hot, dry weather, Pale green to yellow spots on upper surface of leaves, later turn brown, Dark purplish grey fuzz on underside of leaf when high humidity, In wet or very humid conditions disease progresses rapidly, leaves turn brown and look like they were killed by frost, On watermelons, an exaggerated upward leaf curling is common, Aphids feed on leaves, resulting in yellowing. Meager harvest Few Male Blossoms. Holes chewed in leaves, leaf stalk, stems; plant wilts, dies. Symptoms Probable Cause. Foliage discoloration and stunted plants can easily be caused by soil that is too wet and drains poorly or soil that is too compacted for good root growth. Squash are cucurbit plants with many species variations, including the popular zucchini. 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. Winter Squash and Pumpkins > Leaves > Discolored leaves. Leaf edges can turn olive green to brown with sudden temperature drops. 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. Squash bugs and whiteflies are the most common culprits of yellowing foliage.

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