There are plenty of weedy corn fields across Ontario as a planting season with weather-induced stops and starts has some growers struggling to get crop in the ground and also stay ahead of the weeds. Getting the jump on those weeds, especially in fields relying on post-emergent herbicide programs is critical, says University of Guelph… Read More

Glyphosate resistance has been confirmed in lamb’s-quarters in Quebec. The finding, which comes from the CÉROM grain research centre, is the first confirmation of glyphosate resistance in the annual weed anywhere in the world. University of Guelph research scientist Dr. Peter Sikkema shared the news with those attending the Ag Business Breakfast Meeting at Ridgetown,… Read More

Weeds can cause up to 58 per cent yield loss in edible beans compared to 50 per cent in corn and 35 in soybeans. That’s just one brick in a wall of weed control insights University of Guelph weed science researcher Dr. Peter Sikkema has accumulated over a 30-year career that includes induction into the… Read More

Common ragweed’s ability to resist the control efforts of different herbicide groups continues to grow across Ontario. Last winter, University of Guelph weed scientist Dr. Peter Sikkema confirmed the presence of Group 14 resistance in common ragweed, making the broadleaf pest resistant to enzyme inhibitors, including branded weed control products such as Reflex and Blazer,… Read More

A widespread rain sweeping across Ontario this past weekend provided plenty of moisture to activate soil-applied, pre-plant herbicides in crop fields throughout the province. With the timely rain, many growers are now asking: after activation do these herbicides have the capability to ‘reach back’ and control already-emerged weeds and grasses such as foxtail? University of… Read More

Glyphosate-resistant Canada fleabane was first confirmed in Ontario in 2010. Fast-forward thirteen years and the weed now has developed resistance to multiple herbicide groups and can be found in Essex County, bordering Michigan, all the way east to Glengarry County, adjacent to the Quebec border. University of Guelph weed scientist Dr. Peter Sikkema has been… Read More

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

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

 

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