Ontario Weed Committee
Month: October 2020
Understanding the Impact and Measures Needed to Address Bt Resistant Rootworm
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 […]
2020 Ontario Grain Corn Ear Mould and Deoxynivalenol (DON) Mycotoxin Survey
Co-authored with Albert Tenuta, Field Crop Pathologist, OMAFRA OMAFRA field crop specialists in collaboration with Grain Farmers of Ontario (GFO) and members of the Ontario Agri-Business Association (OABA) have completed the annual Ontario corn ear mould and DON mycotoxin survey. Corn ear moulds such as Gibberella and their corresponding mycotoxins occur every year in Ontario. […]
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 […]
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 […]
Revised October 2020 – Canadian Bt Corn Trait Tables with Events and Resistance Status
We have revised the Canadian Bt Corn Trait Tables to reflect the current potential cross resistance of corn rootworm in Ontario to all Bt-RW proteins. Here are the latest versions: English: Bt Corn Trait Table (October 2020) with Events and Resistance Status French: Tableau des caractères Bt (Octobre 2020-Français) – Évènements transgéniques et résistances For information on […]
September 2020 Forage Report
Photo: It is impossible to tell by looking at frost-damaged sorghum-sudangrass what the prussic acid levels may be. Silage Corn In fields where rootworm Bt hybrids have been used for three or more consecutive years, resistance among corn rootworm populations is suspected. Producers can no longer rely solely on Bt rootworm hybrids for protection against […]