Western spotted cucumber beetle

Western Spotted Cucumber Beetle Adult

Western Spotted Cucumber Beetle Larva

2000. Ralph E. Berry, Department of Entomology, Oregon State University, Corvallis, OR.

Larvae of western spotted cucumber beetle, Diabrotica undecimpunctata undicimpunctata (Coleoptera: Chrysomelidae), may feed on tubers in potato fields West of the Cascade Mountains. Injury resembles the damage caused by flea beetle larvae. Adults are 6 mm long, yellowish-green with distinct black spots on the wing covers. Mature larvae are 14 to 17 mm long and are white, except the head and last abdominal segment, which are brown. Adults are active during mild periods in the winter but do not begin laying eggs until early May. Larvae are present from mid-May to mid-September. There are two to three overlapping generations each year.

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