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How to handle Bt-resistant rootworm in Ontario

Bt-resistant corn rootworm is one of the big stories in Ontario agriculture this season. It has resulted in yield loss for farmers growing corn this year, but the more serious impact is yet to come.

The breakdown of Bt resistance will likely have long-reaching consequences. Growers are advised to rotate out of corn for next year (or more) to mitigate rootworm populations.

If this isn’t possible, Tracy Baute, field entomologist for the Ontario Ministry of Agriculture, Food and Rural Affairs, recommends planting a non-rootworm Bt hybrid. This will prevent additional pressure on the resistance genes. Baute and other OMAFRA researchers have also provided resources on rootworm mitigation measures and non-corn options for livestock producers. |READ MORE