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
A cool, wet spring has slowed fieldwork and dreams of early planting appear to be disappearing as the calendar turns to May. But the backward conditions have not stalled weed growth in fields across Ontario. That means growers will need to keep a close eye on winter annuals and mounting weed pressure in soybean and corn… 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
Glyphosate resistant waterhemp has spread from Essex Country, Ontario, all the way to Leeds-Grenville County, nearly 700 kilometres away in just seven growing seasons. While the exact path of spread is not known, Dr. Peter Sikkema, weed management professor with the University of Guelph, says that introduction can be through wind dispersal, in livestock feed, or… Read More
The annual Ontario field crop diagnostic days held at Ridgetown, Elora, and Winchester will again go virtual in 2021. The organizing committees of these three highly successful in-field education and learning events are again partnering with crop researchers and extension, along with support from RealAgriculture and a host of sponsors to bring you a series… Read More
Corteva Agriscience and BASF Canada Agricultural Solutions (BASF) have announced a collaboration and joint approach to weed control by recommending the combined use of Liberty 200 SN and Enlist herbicides on Enlist E3TM soybean acres. The combination will work especially well on weeds like waterhemp and Canada fleabane, that are now glyphosate resistant in many… 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. In 2020, Sikkema and his team collected seeds in Leeds & Grenville County. “So that means glyphosate-resistant waterhemp has moved 700… Read More
Raven Industries has joined AGCO and BASF as the newest Operation Weed Eradication coalition member, to support farmers in their weed control efforts. Operation Weed Eradication is an industry-wide mission with the goal of enlisting tough-minded farmers and industry leaders whose approach is that the last weed standing is the strongest, most capable and the… 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
Do you need to manage herbicide-resistant weeds? Could you use more flexibility during the busy planting season? Does heavy weed pressure make it difficult to keep fields clean early in the season? These are all questions growers should be asking as they plan their 2021 soybean weed control programs, says BASF technical development manager Rob… 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
After wreaking havoc in the U.S. and parts of Ontario, herbicide-resistant waterhemp has arrived on the scene on the eastern side of the Canadian Prairies. Patches of the prolific weed — a cousin to Palmer amaranth — were found in multiple fields in five municipalities in Manitoba last year. In one case, over 30 acres… Read More
Earlier this year, Dr. Peter Sikkema, professor with the University of Guelph and his research team confirmed Group 14 resistance in waterhemp at multiple locations in Ontario. Sikkema’s research team, including graduate student Lauren Benoit, has also confirmed waterhemp with cross-resistance to Groups 2, 5, and 9, as well as 14. In this episode of the Resistance Management… Read More
If you’ve ever been frustrated by a weed’s seemingly amazing ability to survive and even thrive after being knocked back, cut down, or sprayed, this discussion is for you. You’re not imagining things — weeds really do have adaptations that make them harder to kill and allow them to spread faster and easier than desired… Read More
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