Potato, Irish-Cucumber beetle

Western spotted cucumber beetle (Diabrotica undecimpunctata Linnaeus)

Pest description and crop damage Larvae may feed on tubers in potato fields west of the Cascade Mountains. Adults are 0.33 inches long, yellowish green, with distinct black spots on the wing covers. Mature larvae are about 0.33 inches long and white with brown on both ends. Adults feed on leaves and stems.

Management-chemical control: HOME USE

Apply when beetles first appear and repeat at 7- to 10-day intervals as needed.

  • acetamiprid
  • azadirachtin (neem oil) -Some formulations are OMRI-listed for organic use.
  • Beauvaria bassiana-Some formulations are OMRI-listed for organic use.
  • carbaryl
  • cyfluthrin
  • deltamethrin
  • insecticidal soap-Some formulations are OMRI-listed for organic use.
  • kaolin-Applied as a spray to foliage it acts to repel certain insect pests. Some formulations are OMRI-listed for organic use.
  • permethrin
  • pyrethrins (often as a mix with other ingredients)-Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

See: