Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Summer Squash and Zucchini > Wilting/drooping leaves
Summer Squash and Zucchini > Leaves > Wilting/drooping leaves
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Squash Vine Borer
Melittia cucurbitae
- 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
- More information on Squash Vine Borer
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Squash Bug
Anasa tristis
- Feeding can cause yellowing and wilting
- Common on squash and pumpkins
- 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
- Active from May through September
- More information on Squash Bug
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Bacterial Wilt
Erwinia tracheiphila
- Leaves first appear dull green, wilt during the day, and recover at night
- Eventually wilted leaves die
- 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)
- More information on Bacterial Wilt
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Cold Temperature
- Weather has been cold (below 50°F) and wet
- Soil is cold (below 62°F) and damp to the touch
- Leaf edges turn olive green to brown
- In severe cases entire leaves, young shoots or the entire plant may be completely discolored and wilted
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Phytophthora Blight
Phytophthora capsici
- The entire plant may collapse if root and crown rot occurs
- Stem and leaf petiole lesions are light to dark brown, water soaked and irregular
- Large irregular brown spots on leaves
- Fruit develop soft, water-soaked lesions which expand to large sections of the fruit
- Infected fruit are soft, easily punctured and often collapse
- Infected fruit are covered with white fungal growth
- More information on Phytophthora Blight
