Extension > Garden > Diagnose a problem > What's wrong with my plant? > Vegetable > Cucumber > Holes in leaves
Cucumber > Leaves > Holes in leaves
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Striped Cucumber Beetle
Acalymma vittatum
- Feeds on flowers and directly on fruit, causing scarring
- Beetles feed on leaves and can completely defoliate a plant
- Shows a preference to cucumbers, certain varieties of winter squash, and zucchini
- Vectors bacterial wilt
- Adult is yellow-green in color, about 1/4 inch long, and marked by three black stripes
- Active from June through September
- More information on Striped Cucumber Beetle
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Anthracnose
Colletotrichum obriculare
- Somewhat circular dry brown leaf spots form near veins
- Center of leaf spot often falls out, leaves appear ‘shot hole’
- Circular sunken dark spots on fruit, salmon colored spores form in the center when wet
- Commonly appears mid to late season
- Also commonly infects melons and pumpkin
- More information on Anthracnose
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Angular Leaf Spot
Pseudomonas syringae pv. Lachrymans
- Leaves develop small, angular, brown or straw-colored spots with a yellow halo
- Leaf spots dry and drop out, leaving irregularly shaped holes in the leaves
- Water soaked to tan small circular spots on fruit
- Sticky drops of whitish liquid for on the underside of the leaf when wet, dry to a crust when dry
- More information on Angular Leaf Spot
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Scab
Cladosporium cucumerinum
- Irregular gray leaf spot with a yellow halo
- Center of leaf spot falls out, leaves look shot holed or ragged
- Cucumber, summer squash, zucchini, and pumpkin have sunken fruit spots are covered with greenish black velvety fungal growth
- Winter squash have raised corky areas around fruit infections, internal rot varies depending on resistance of variety
- Watermelon is very resistant
- More information on Scab
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Spotted Cucumber Beetle
Diabrotica undecimpunctata howardii
- Beetles feed on leaves, flowers, and fruit
- Vectors bacterial wilt
- Adult is 1/4 inch long, bright yellow-green body with 12 black spots
- Active from June through September
- More information on Spotted Cucumber Beetle
