Bt resistant rootworm

Understanding the Impact and Measures Needed to Address Bt Resistant Rootworm

Tracey BauteTracey Baute October 26, 2020 599 Comments Off on Understanding the Impact and Measures Needed to Address Bt Resistant Rootworm
Baute Bug Blog

Why be concerned about the Bt resistant rootworm populations showing up in Ontario? Dr. Jocelyn Smith, University of Guelph Ridgetown Campus stands in a field that has cross resistant rootworm.  The grower experienced more than 50% yield loss in this 2nd year silage corn field planted with a pyramid hybrid in 2020.  Jocelyn discusses the impacts of these resistant rootworm…

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

OMAFRA Field Crop TeamOMAFRA Field Crop Team October 9, 2020 613 Comments Off on Non-corn options for livestock producers to manage Bt-resistant corn rootworm
Baute Bug Blog

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 least one year. Growers are…

Mitigation Measures for Bt Resistant Corn Rootworm

Tracey BauteTracey Baute October 9, 2020 755 Comments Off on Mitigation Measures for Bt Resistant Corn Rootworm
Baute Bug Blog

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 rootworm population present in Ontario….

Scouting Guidelines to Determine Possible Rootworm Resistance

Tracey BauteTracey Baute August 20, 2020 667 Comments Off on Scouting Guidelines to Determine Possible Rootworm Resistance
Baute Bug Blog

Scouting for corn rootworm injury is important to detect potential resistance to rootworm Bt traits and to plan management options for the next growing season. It is especially important to report any fields showing signs of suspected resistance to your corn agronomist and the provincial entomologist. Rootworm larvae feed below ground on corn roots from late May until late July….