Waterhemp, the invading resistant weed, often misidentified as redroot, green, or smooth pigweed, continues to build resistance against herbicide control in Ontario. University of Guelph weed scientist Dr. Peter Sikkema and his research team have now confirmed waterhemp resistance to Group 27 herbicides in the province. He shared the news earlier this week during a Ridgetown/Simcoe… Read More
Glyphosate supply has been a hot topic this winter as growers look for ways to navigate through short supplies of this critical weed control tool. On this episode of RealAgriculture’s Soybean School, University of Guelph weed scientist Dr. Peter Sikkema joins Bernard Tobin to discuss best practices and strategies to help growers make the most of… Read More
When glyphosate-resistant waterhemp was first discovered in Lambton County in 2014, University of Guelph weed scientist Peter Sikkema never imagined the course the weed would take across Ontario, or the speed it would travel. Fast forward to 2022 and glyphosate-resistant waterhemp has moved 700 kilometres east to Leeds & Grenville County. The invading resistant weed, often… Read More
It’s time for agronomy hot topics on Day 4 of Ontario Diagnostic Days! The annual Ontario field crop diagnostic days held at Ridgetown, Elora, and Winchester are again virtual in 2021. Crop nutrition, weed control and planting depth and timing are the focus of this episode. We kick it off with Ontario Ministry of Agriculture, Food… Read More
When’s the best time of day to spray herbicides? Morning, noon, or night? University of Guelph weed scientist Dr. Peter Sikkema says that every herbicide has a time-of-day effect but generally speaking, growers get the best weed control at 3:00 pm in the afternoon. That’s Sikkema’s conclusion based on time-of-day efficacy trials he conducted using… Read More
When it comes to weed control, getting it right is key for edible bean success. University of Guelph research shows, on average, weed interference can cause yield losses up to 56 per cent compared to 50 per cent in corn and 36 per cent in soybeans. When comparing edible beans and soybeans, U of G… Read More
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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