Taking Root: Management Options for Bt-Resistant Corn Rootworm on Ontario Farms

This webinar features OMAFRA specialists who provided an update on Bt-resistant corn rootworm, the impact on cropping systems and feed supplies, mitigation strategies to reduce the impact of Bt corn rootworm resistance, and alternative feeding options. While this webinar is open to anyone, it is geared towards cattle producers (dairy and beef). The webinar aired […]

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Non-corn options for livestock producers to manage Bt-resistant corn rootworm

In fields where Bt rootworm corn hybrids have been used for more than three consecutive years, resistance among corn rootworm populations is suspected. Growers can no longer rely solely on Bt hybrids for protection against rootworm injury. The best management practice to reduce the resistant rootworm population is to rotate out of corn for at […]

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Mitigation Measures for Bt Resistant Corn Rootworm

Extensive injury by corn rootworm (CRW) to pyramid Bt rootworm (Bt-RW) hybrids was observed in several Ontario counties in 2020, suggesting that CRW populations have developed resistance to multiple Bt-RW proteins. The Canadian Corn Pest Coalition (CCPC) and OMAFRA have developed mitigation recommendations for continuous corn producers, in hopes of knocking back the resistant corn […]

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Continuous Corn Growers Should Check Fields for Rootworm Resistance to Bt Hybrids

Canadian Corn Pest Coalition News Release: Corn rootworm (CRW) has historically been one of the most important pests of corn in Canada and can cause extreme economic loss and increased management costs.  High CRW pressure in Ontario in 2020 is challenging current Bt corn rootworm hybrids and several growers of Bt rootworm hybrids are reporting […]

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Scout Now for Rootworm Activity in Corn

Authors:  Jocelyn Smith and Andrea Hitchon, University of Guelph Ridgetown Campus The time to start scouting corn for corn rootworm has arrived! There are a few important objectives for scouting for rootworm injury including: scouting can help protect yield, plan control measures for next year, and detect potential cases of resistance to Bt traits. The […]

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Corn Soil Insect Primer

Early season corn insect pests can significantly impact stand establishment. Below are the main corn seedling pests along with scouting technique, action thresholds and management strategies. (OMAFRA Publication 811, Agronomy Guide, Chapter 13 and Publication 812, Field Crop Protection Guide) Wireworm Description: Wireworms are 7 – 35 mm (1/4 to 1-1/3 inches) long, cylindrical, copper-brown […]

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Wanted: Corn Rootworm Beetles

Researchers at the University of Guelph are looking for fields with high numbers of corn rootworm beetles. Beetles will be used for resistance monitoring for Bt traits in corn. If you have unexpected rootworm damage, or a large population of adult beetles please contact: Jocelyn Smith: 519-674-1500 x63551, jocelyn.smith@uoguelph.ca Tracey Baute: 519-674-1696, tracey.baute@ontario.ca Andrea Hitchon: 519-674-1500 […]

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