Western Corn Rootworm (WCRW), Diabrotica virgifera, Family: Chrysomelidae, a major corn pest, was confirmed in the central and eastern Fraser Valley in August 2016. Surveying in August and September revealed varying levels of infestation in fields, in both silage corn and sweet corn. WCRW has also been confirmed in a dahlia crop adjacent to corn fields.
Life cycle: One generation per year, eggs laid in established corn in late summer in soil cracks. Eggs overwinter, hatch in spring, and larvae are attracted to and feed on corn roots of planted corn fields for 1 month. Larvae pupate in soil, and adults emerge in July. Adults feed on corn foliage and pollen, and mate. Beetles are active fliers and will feed on many plants. Females feed for two weeks, and then lay eggs in corn fields. Both males and females live for about 1 month.
Management includes: Crop rotation out of corn every 2-4 years, use of seed treatments or in-furrow sprays at planting, foliar spray for adults in July-August.
If you have questions, contact: British Columbia Ministry of Agriculture
Abbotsford Ph: 604-556-3001
Kelowna Ph: 250-861-7681
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