Holes chewed in leaves, leaf stalk, stems; plant wilts, dies. > 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. 1 of 9. Squash bugs and whiteflies are the most common culprits of yellowing foliage. Anthracnose is a fungal disease that attacks the leaves and fruit of the squash plant. Summer Squash and Zucchini > Leaves > Discolored leaves. 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. 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 …

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.

1 of 9. Leaves wrinkled or curled; discolored, stunted, tend to fall off Aphids. Possible Problems of Summer Squash. Too much fertilizer can result in salt injury. 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. Along with passing diseases onto the squash, feeding pests can also be the direct cause for the squash’s yellowing foliage. Skip to Left navigation Skip to Main content Skip to Footer, Extension > Garden > Diagnose a problem > What's wrong with my plant? Extreme cold or heat will slow plant growth and affect flowering and fruit set. Squash are cucurbit plants with many species variations, including the popular zucchini.

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