News

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.

This report provides a summary of research conducted by the Gassmann Lab at Iowa State University to evaluation insecticide products and traits for corn rootworm management.

This 2-page document lists the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects and herbicide traits.

The most recent report of corn rootworm beetle counts is now available! This report covers beetle counts on sticky traps placed around the U.S. and Canada in 2024 as well as relevant field history information.

In Iowa, the species of corn rootworm (CRW) that are of economic importance include western corn rootworm (Diabrotica virgifera virgifera LeConte) and northern corn rootworm (D.

The Canadian “Bt” Corn Trait Tables for 2024 are now available:

English:  Canadian Bt Corn Trait Table for April 2024

This 2-page document list the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects and herbicide traits.

Western corn rootworm (WCR) and northern corn rootworm (NCR) continue to dominate as
economic pests throughout the U.S. and Canada. Recently, high corn rootworm

Results from the 2023 Ontario corn rootworm (CRW) trap sites monitored through the Adult Corn Rootworm (CRW) Trap Monitoring Network have been summarized in the infographic below.

Corn rootworm egg hatch in Iowa typically occurs from late May to the middle of June, with an average peak hatching date of June 6 in central Iowa. Development is driven by soil temperature and measured by growing degree days (GDDs).

The Canadian Bt Corn Trait Tables have been updated for March 2023. These tables include all registered Bt Corn Trait Packages and indicates which Bt proteins and herbicide tolerant traits they contain and pests they target.

This 2-page document list the types of Bt present in all commercialized corn in the U.S.A. in a concise format. It presents the trade names for traits, Bt event, protein(s) expressed, targeted insects, and herbicide traits.

Tracey Baute from Ontario publishes an infographic with key takeaways from the corn rootworm monitoring network in 2022.

Western corn rootworm (WCR) and northern corn rootworm (NCR) continue to dominate as economic pests throughout the U.S. and Canada.

Results summary from abstract: "Collectively, results indicate that northeast Nebraska WCR populations were in the initial stages of resistance evolution to Cry34/35Ab1 during 2018–2019.

The goal of this research program is to serve the agricultural community of Iowa by monitoring and evaluating the performance of registered and precommercial insecticides and transgenic corn hybrids.

Western and northern corn rootworms are serious pests of corn throughout the Corn Belt (Photo 1).

Western and northern corn rootworm are serious pests of corn throughout the Corn Belt.

Last year, entomologists and field specialists with Iowa State University Extension and Outreach received many questions about effective management of corn rootworms as populations have increased in the past two years and farmers have experienced