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…
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….
Tracey Baute October 9, 2020 188 Comments Off on Revised October 2020 – Canadian Bt Corn Trait Tables with Events and Resistance StatusWe 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 which hybrids or products have…
Tracey Baute August 20, 2020 613 Comments Off on Scouting Guidelines to Determine Possible Rootworm ResistanceScouting 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….
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 unexpected injury by CRW to…
Reports have been coming in about pod feeding from bean leaf beetle (BLB) in IP, food grade and seed soybeans. Pod damage on crush beans typically does not warrant control. Foliar feeding (defoliation) is rarely the concern this time of year. But BLB can feed on the surface of the pod which exposes the seed inside to pod diseases that…
Here is the latest update on where the trap catches are for western bean cutworm in the region based on trap site data entered into the Great Lakes and Maritimes Pest Monitoring Network. Peak flight for Ontario and most other states and provinces on the network (except Michigan) occurred during Week 11 (Aug 3-9) (see Fig. 1). Trap catches are…
Before I talked about the WBC trap data, I want to thank everyone who set up a trap this year and are entering their data into the network. Despite COVID-19, there are more than 1000 WBC traps in the system! That is a record and helps us figure out what the flight patterns are. Now for the trap results. We…
Tracey Baute July 28, 2020 472 Comments Off on Seeing Lots of Rootworm Adults in Rootworm Bt Fields? Let Us Know!Corn rootworm adults emerged a few weeks earlier than usually and are quite abundant this year. This is particularly concerning when the adult populations are high in corn on corn fields planted with a rootworm Bt hybrid. This could be an indication that rootworm populations have developed resistance to the rootworm Bt traits involved. To know for sure if your…
Many reports are coming in about silk clipping in corn. Three main culprits include corn rootworm beetles, Japanese beetles and redheaded flea beetles. Regardless of which one is doing it, it comes down to when and where they are clipping and by how much. Corn silks can grow as much as an inch or more a day, though most of…
Reports have already come in of a few soybean fields that have reached threshold and need to be sprayed this week for spider mites. This hot, dry weather at the start of wheat harvest is the perfect scenario for significant spider mite infestations to move into soybeans, dry beans and possibly even the corn crop. Spider mites are currently on…
A number of reports have come in that cereal aphid populations are increasing. Scouting cereal fields is advised. Natural enemies are present in many fields so I recommend using the Cereal Aphid Manager app to help you decide if a spray is required based on your aphid and natural enemy populations. The cereal aphid threshold is 12 to 15 aphids…
Tracey Baute April 22, 2020 619 Comments Off on Western Bean Cutworm 2020 Infosheets – Corn and Dry BeansIt is still too early to predict what western bean cutworm (WBC) might do this year but to help prepare, we have updated the WBC infosheets for 2020. 2020 WBC Infosheet for Corn 2020 WBC Infosheet for Dry Beans WBC activity was delayed in 2019, in step with the delay in growing degree day (GDD) accumulation. Some regions caught up…
Tracey Baute April 21, 2020 647 Comments Off on 2020 Canadian Bt Corn Trait Tables with Events and Resistance Status -English and FrenchThe Canadian Bt Corn Trait Tables have been updated for 2020 with additional information including a list of the Bt Events and Pest Resistance Status. English: Bt Corn Trait Table (April 2020) with Events and Resistance Status French: Tableau des caractères Bt (Avril 2020-Français) – Évènements transgéniques et résistances For information on which hybrids or products have obtained EU approval, visit…
Tracey Baute April 15, 2020 2373 Comments Off on 2020 Great Lakes and Maritimes Pest Monitoring NetworkThe Great Lakes and Maritimes Pest Monitoring Network will be running again in 2020. We are monitoring for black cutworm (BCW), corn earworm (CEW), European corn borer (ECB), fall armyworm (FAW), true armyworm (TAW) and western bean cutworm (WBC) across the region and are providing an interactive real-time map and trap data dashboard that summarizes the trap results by pest….