If you are seeing ragged holes in leaves, damaged seedlings, or plants suddenly wilting without warning, cucumber beetles may be the cause.
What They Look Like
Cucumber beetles are small, fast-moving beetles that are bright yellow with black markings.
Striped cucumber beetles have three black stripes running down their backs.
Spotted cucumber beetles have round black spots instead of stripes.
Both types have dark heads and antennae and will quickly fly or drop when disturbed.
Damage Signs
Small to large irregular holes in leaves
Young seedlings may be chewed down or killed
Flowers may be damaged or missing
Fruit may show scarring or pitting
Plants may suddenly wilt even when well watered
Plants Affected
Cucumbers
Squash and zucchini
Pumpkins
Melons such as cantaloupe and watermelon
Gourds
Fast Control (Start Here)
Protect young plants early using row covers
Remove covers at flowering to allow pollination
Handpick beetles when numbers are low
Focus efforts early in the season when beetles first appear
Additional Control Options
Spray neem oil or insecticidal soap as soon as beetles are noticed
Treat repeatedly to stay ahead of new beetles
Use stronger products only if pressure is high
Target adults early before populations build
Prevention
Remove plant debris at the end of the season
Rotate crops away from previous cucurbit areas
Use row covers to prevent early feeding
Grow resistant or tolerant varieties when possible
Plant trap crops if you want to draw beetles away from main crops
Notes for Gardeners
Damage early in the season has the biggest impact
Even a small number of beetles can cause problems
Cucumber beetles spread bacterial wilt, which cannot be treated
If a plant suddenly wilts and does not recover, it should be removed
Prevention early in the season matters far more than trying to fix problems later
See Also
Garden Pest Identification Guide (The Dirty Dozen)
Using Row Covers in the Garden
