Pacific Northwest Insect Management Handbook

Hop-Western spotted cucumber beetle

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Image related to Hop-Western spotted cucumber beetle
Western spotted cucumber beetle
Diabrotica undecimpunctata undecimpunctata Mannerheim
Adult female adult
© Ken Gray Insect Image Collection
Image related to Hop-Western spotted cucumber beetle
Western spotted cucumber beetle
Diabrotica undecimpunctata undecimpunctata Mannerheim
Immature on host
© Ken Gray Insect Image Collection
Image related to Hop-Western spotted cucumber beetle
Western spotted cucumber beetle
Diabrotica undecimpunctata undecimpunctata Mannerheim
Adult female adult
© Ken Gray Insect Image Collection
Image related to Hop-Western spotted cucumber beetle
Western spotted cucumber beetle
Diabrotica undecimpunctata undecimpunctata Mannerheim
Egg(s) on host
© Ken Gray Insect Image Collection

Diabrotica undecimpunctata undecimpunctata

Pest description and crop damage Yellowish green, black-spotted beetles. They feed on foliage and growing tips and occasionally feed on hop cones. A pest in western Oregon and western Washington.

Management-chemical control

  • pyrethrins/azadirachtin (Azera) at 0.013 to 0.0044 lb ai/A azadirachtin/0.014 to 0.048 lb ai/A pyrethrins. PHI 0 days. REI 12 hr. Apply when pest populations first appear. Reapply every 5-7 days as needed up to 10 times per season. Do not apply more than 0.050 lb ai/A pyrethrins per season. Some formulations are OMRI-listed for organic use. Group 3A insecticide.

Kaur, N. (Ed.). 2024 Pacific Northwest Insect Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

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