Oviposition Preference, Larval Survival, Flight Trends, and Control Measures for Western Bean Cutworm (Lepidoptera: Noctuidae) in Dry Bean

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Goudis, Lindsey
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University of Guelph

Western bean cutworm, Striacosta albicosta (Smith) (Lepidoptera: Noctuidae) is a pest of corn and dry beans in the midwestern United States, but its pest status in Ontario dry beans is poorly understood. Studies were conducted to examine oviposition preference and larval survival, moth captures, and insecticide efficacy and timing. No preference was found between market classes for oviposition, however larval survival was greatest on light red kidney and lowest on adzuki bean. Moth captures were highest on coarse and fine textured soil, and within 20 km of the Lake Huron shoreline. Thiamethoxam, spinetoram, methoxyfenozide, lambda-cyhalothrin, and chlorantraniliprole were all effective at reducing feeding damage, and application 4 – 18 days after 50% egg hatch was optimal. At current population levels however, insecticide applications provided no economic benefit, though continual monitoring of this pest in dry bean fields is recommended.

Striacosta albicosta, Phaseolus vulgaris, Insecticide efficacy, Growing degree days