GFM Network News


The trouble with identifying waterhemp in the field is that growers often dismiss it as one of the other pigweed species.

The latest on waterhemp

Incredibly, the weed is already resistant to four modes of action in Ontario, with more in danger

Reading Time: 6 minutes In U.S. farm media circles, it seems that every week there’s another report, another bulletin, another research paper about waterhemp. Often it’s a confirmation of another find in a midwest county or state. More recently, reports indicate the weed is resistant to seven different modes of action with the latest — Group 15 herbicides — […] Read more

Canada fleabane seedlings that will be treated with glycine and glyphosate combinations in a growth chamber environment.

Pest Patrol: The continuing fight against glyphosate-resistant Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes Glyphosate-resistant Canada fleabane is found in 30 counties across Ontario and can cause yield losses exceeding 50 per cent in both corn and soybeans. Since there are only a few other herbicides that are effective at controlling it, this glyphosate-resistant weed has been one of the most troublesome weeds in Ontario. So, what if you […] Read more


Figure 1. An overhead look at the level of control that cereal rye has provided when it was seeded the previous fall (mid- November) at 60 lbs./ac. (left) compared to no cereal rye planted (right).

PHOTOS: Pest Patrol: Cover crops versus glyphosate-resistant weeds

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: < 1 minute Q: Can cover crops be an effective tool to manage glyphosate-resistant weeds? A: My colleague Dr. Clarence Swanton (University of Guelph) used to say that based on research he did in the 1980s, one should not expect to control weeds with cover crops. Their utility was in preventing soil erosion and improving soil health but […] Read more

Preliminary results suggest a built-in may outperform the Australian tow-behind version of the Harrington Seed Destructor in the hillier conditions in Western Canada.

If you can’t spray ’em, crush ’em

While there’s no single solution to herbicide resistance, the Harrington Seed Destructor may be part of the toolbox

Reading Time: 5 minutes Some of the most creative insights and practical solutions for battling herbicide-resistant weed control come from Australia. It was there, in 1996, that the world’s first documented case of glyphosate resistance was found in annual ryegrass, which is Australia’s No. 1 weed problem. As of January of this year, the Australian Glyphosate Sustainability Working Group […] Read more


AGCO introduced the new C Series RoGator with impressive upgrades in August.

New C Series RoGators

AGCO re-engineers its sprayer line with LiquidLogic technology

Reading Time: 2 minutes If there’s one word that’s taking up a lot of air in the room when it comes to herbicide discussions this year, it’s “resistance.” The growing threat from herbicide-resistant weeds has become a reality in nearly all regions and threatens to get much worse. Everyone in the industry is looking for solutions, and AGCO thinks […] Read more

Managing herbicide resistance costs

Farmers considering herbicide resistance strategies are looking at the economics first

Reading Time: 5 minutes There are several reasons many farmers haven’t yet adopted herbicide resistance management (HRM) plans. These include a lack of information, the complexity of different management strategies and limited time. But a major reason is still economics. Many farmers worry about the costs of implementing a resistance management plan, especially if they’re uncertain about the potential […] Read more


Mowing that patch before it went to seed might have been a better strategy that using an ineffective herbicide.

The more you spend, the less they work

If you want to keep using herbicides, give them an occasional rest and try a winter cereal or a heavier seeding rate

Reading Time: 3 minutes Neil Harker says that when you no longer have the big hammers in the tool box, it’s time to use the little ones. For the Agriculture and Agri-Food Canada (AAFC) weed scientist, wild oat herbicides are the big hammers, and the little ones are integrated weed management practices. Harker says that although western Canadian producers […] Read more

Minnesota probes Palmer amaranth’s sudden appearance

Reading Time: 2 minutes Chicago | Reuters — Minnesota has launched an investigation to find the source of seed mixes contaminated with weed seeds after the aggressive, herbicide-resistant Palmer amaranth weed was found on 30 areas planted in a federal conservation program. The weed grows very fast, reaching up to eight feet in height and can hold back commercial […] Read more


Pest Patrol: Have genetically engineered (GE) crops resulted in more herbicide-resistant weeds in Ontario?

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes There is a belief that the increased acreage planted to genetically engineered (GE) crops has led to an increase in herbicide-resistant weeds. However, results from the University of Guelph’s herbicide-resistant weed-testing laboratory indicate otherwise. Table 1 (below) summarizes the number of species confirmed as resistant to common herbicides used in Ontario during the past 40 […] Read more

EPA approves Monsanto’s dicamba weed killer

Reading Time: < 1 minute U.S. seeds and agrochemicals maker Monsanto Co. has secured approval from the U.S. Environmental Protection Agency for a new dicamba-based weed killer designed for its next generation biotech soy and cotton varieties, the company said on Wednesday. While approval had been expected, it is seen as a major step forward for the company’s newest herbicide […] Read more