RESEARCH ARTICLES/INFORMATION

Research Category: Soybean Agronomy Year: 2004 Researcher: Peter Sikkema Institution: U of Guelph Topic: Weed management projects: problem weeds; waterhemp. Funding: $7,500 Research Details: Waterhemp was first identified in Essex and Lambton counties in Ontario in 2002. It is an extremely aggressive annual broadleaf weed and is considered the number one weed problem in both corn and soybean production in the mid-western United States. The waterhemp in Lambton county is resistant to both the group 2 (ALS inhibitors) and group 5 (triazine) herbicides. It is anticipated that this weed will spread rapidly based on experiences in the U.S. Midwest. The proposed research will determine the germination pattern, seed production and competitiveness of this weed in corn and soybeans in Ontario. In addition, herbicide efficacy trials will be established in corn and soybeans to determine which herbicides are most effective for the control of this weed. Objectives: a) To determine the emergence pattern of waterhemp under Ontario climatic and agronomic conditions. b) To determine the competitiveness and seed production of waterhemp in corn and soybeans. c) To determine the most effective soil applied and postemergence herbicides for control of waterhemp in corn and soybeans File: