Glyphosate-resistant waterhemp was first identified in Ontario in 2014. Since that time the weed, which hails from the pigweed family, has spread across the province with confirmed sightings in 14 counties in 2019. To make matters more troubling, waterhemp resistance continues to grow beyond glyphosate, and now includes multiple resistance to Group 2, 5, 9… Read More
It’s time for Day 3 of the virtual Ontario Diagnostic Days! This week, we’re joined by Dr. Peter Sikkema with the University of Guelph, and Mike Cowbrough, weed specialist with the Ontario Ministry of Agriculture, Food and Rural Affairs. This episode focuses on weed management, specifically on glyphosate resistant Canada fleabane and waterhemp, and the… Read More
As of 2019, glyphosate resistant waterhemp has been confirmed in 13 counties in Ontario. Christian Willemse, a master of science student at the University of Guelph, under the supervision of Dr. Peter Sikkema, will continue a survey on glyphosate resistant waterhemp this fall as part of his master’s project. Farmers and agronomists are encouraged to… Read More
Crop researchers and agronomists are encouraging Ontario farmers to continue to follow established stewardship recommendations when using dicamba herbicides. Last week, a U.S. court decision to cancel the registration of in-crop use of dicamba herbicides left regulators, product manufacturers, herbicide applicators and farmers scrambling to understand the ramifications of the ruling and the implications for… Read More
What effect will extreme cold temperatures have on early-season weed control? That’s a question University of Guelph, Ridgetown College weed scientist Dr. Peter Sikkema has been hearing a lot lately. With farm fields across Ontario being punished by extreme cold temperatures that have dropped to nighttime lows of minus 5 degrees C, many growers are… Read More
For people who play the stock market, an opportunity to cash in on an 826 per cent return on investment doesn’t come along too often. But Ontario farmers can realize this type of return every time they apply herbicide in corn fields that experience intense weed pressure, says University of Guelph weed scientist Dr. Peter… Read More
Herbicide resistance is nothing new to Ontario farmers. It all started in 1973 when triazine-resistant lamb’s-quarters were found on a farm near Ripley, Ontario. Group 2 herbicide-resistant weeds were first documented in 1996. Fast forward to 2018, and we find that the province is now home to a host of glyphosate-resistant weeds including Canada fleabane, giant… Read More
It’s not necessarily the happiest of discoveries, but it’s a first-of-its-kind discovery, nonetheless. Work out of the University of Guelph has confirmed Group 14 resistance in waterhemp at multiple locations in Ontario. What’s more, Dr. Peter Sikkema’s research team, including graduate student Lauren Benoit, has also confirmed waterhemp with cross-resistance to Groups 2, 5, and… Read More
If you’ve noticed more than a few fleabane “escapes” in recent years, you’re not alone. Glyphosate resistant Canada fleabane has spread across more than 700 kilometers of Ontario crop land in just five years. Despite its incredible distribution, Canada fleabane wasn’t the first glyphosate resistant weed found in Ontario, says Dr. Peter Sikkema, field crop… Read More
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