Palmer amaranth could be the next glyphosate resistance weed problem for Ontario farmers. University of Arkansas weed scientist Jason Norsworthy calls it “pigweed on steroids.” Norsworthy, who first saw glyphosate-resistant palmer amaranth in Arkansas in 2006, says the weed can grow two to three inches a day after it reaches four inches tall. “You can… Read More

According to Neil Harker, research assistant with Agriculture and Agri-Food Canada, wild oat management through herbicide application costs western Canadian producers around $500 million annually. Herbicide resistance in many weed biotypes is cropping up — resistance within wild oat populations has been nagging at farmers’ fields for years and is spreading. How can we combat… Read More

The advent of glyphosate resistant weeds has and will continue to complicate pre-plant weed removal. Farmers need to match herbicide resistance management and control options with targeted weed species to ensure not only an effective kill, but also to avoid limiting control options later. Glyphosate-resistant giant ragweed has been confirmed in Ontario, and farmers set… Read More