We are once again reaching out to see if anyone is interested in monitoring corn rootworm (CRW) through the CRW Trap Network this year. Monitoring with sticky traps can help you determine if you have a Bt resistant corn rootworm problem and it helps us keep track of where these problem fields are. It can […]
The Corn Rootworm Trap Network is 5 years old! We have learned a lot about corn rootworm populations here in Ontario and we value the efforts of all trap participants who have monitored sites each season. A special thanks goes to Dan Bihari, Senior GIS Specialist, OMAFA for maintaining the trap network platform and to […]
There are a few pests to keep an eye on over the next few weeks. Western Bean Cutworm We likely reached peak moth flight either last week for most of the southern counties or this week for the rest of the province, except Northern Ontario, based on the Degree Day Prediction Model and trap counts […]
Corn Pests to Watch for Over the Next Month Tracey Baute, Entomologist – Field Crops, OMAFA Corn Rootworm Like many other pests, corn rootworm (CRW) is ahead of schedule this year. Adult beetles will be emerging this week or next. Anyone considering trapping for adults as part of the Corn Rootworm Trap Network should be […]
Ontario needs corn rootworm trap participants, whether you’ve monitored traps in the past few years or not. Fields with a history of corn on corn are the preferred target. Any participants from last year are encouraged to use some of the same fields as last year, even if they rotated out of corn. This will help […]
Results from the 2021 Ontario trap sites participating in the Adult Corn Rootworm (CRW) Trap Monitoring Network have been summarized in the infographic below. A more detailed report for all trap sites across North America was prepared by Ashley Dean and Erin Hodgson at Iowa State University. Thank you to Dan Bihari, Senior GIS Specialist, […]
Several US states and Canadian provinces are joining forces to monitor for adult corn rootworm (CRW) beetles this year. Though some US states have been monitoring adult rootworm beetles using sticky traps for several years now, trapping for CRW is relatively new for Ontario. Weekly trap data for all trap sites involved will be collected […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]
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 […]