GFM Network News


Figure 1: A field of winter wheat where bluegrass has headed at the same time.

Pest Patrol: Bluegrass management in winter wheat

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Yield losses of more than 50 per cent can occur from bluegrass competition in winter wheat. As well, because bluegrass species often head at the same time as winter wheat, they could intercept and reduce the amount of fusarium head blight fungicide that actually reaches the grain head (Figure 1 at top).  There are several […] Read more

Big Canada thistle plants can spell trouble in the combine, especially when there are large patches of them.

Fall herbicide application timing in canola

To control perennial weeds in canola, there are benefits to both pre- and post-harvest control options — the deciding factor could be tied to your goals

Reading Time: 5 minutes Glacier FarmMedia – When deciding between a pre-harvest or post-harvest spray application to control tough perennial weeds, there are always some key considerations for farmers. The extent of the weed problem and harvest timing are important ones, of course, but other factors such as herbicide cost and killing frost also play into the decision. To […] Read more


Pigweed at the two-leaf stage of growth which is the optimum stage for some post-emergent herbicides.

PHOTOS: Pest Patrol: Maximum weed stage where herbicides are still effective

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: < 1 minute A generation of glyphosate use has redefined what we mean by “apply herbicides to weeds that are small and actively growing.” Many interpret “small” to mean “about 15 cm” (six inches). If using “older” herbicides to manage glyphosate resistant weeds and your idea of small is 15 cm, then you may be disappointed with the […] Read more

The stage of lamb’s quarters when it is most susceptible to conventional herbicides. When lamb’s quarters is taller than 10 cm, control with glyphosate is reduced when applying at a rate of 0.67 l/ac. (540 g/l concentration). Increasing the rate to 1.34 l/ac. is needed to achieve adequate control.

Pest Patrol: Maximizing control of common lamb’s quarters

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes Lamb’s quarters has consistently been identified as the most abundant and problematic weed affecting field crop production in Ontario even though the Pest Management Regulatory Agency database contains hundreds of herbicides that list lamb’s quarters as a susceptible weed. There is an arsenal of products available to farmers for the control of this weed, so […] Read more


It’s recommended that the Hypro 3D nozzle is in a forward-backward configuration to ensure better coverage.

A nozzle approach to spray coverage

Design of this 3D sprayer nozzle began in the U.K. and now has a global reach

Reading Time: 6 minutes Although they’re essential on today’s commercial farms, sprayers typically rank third in importance behind seeding equipment and combines, and maybe that’s fair considering the importance of how the crop starts and how it finishes. Still, there’s no denying that the jobs you do with your sprayer are taking on new importance. Just think herbicide-resistant weeds, […] Read more

Farmers are looking for a solution to glyphosate-resistant Canada fleabane, which is a growing concern.

Can less be more when tackling herbicide resistance?

A coming formulation of glufosinate seeks to cut rates yet maintain efficacy

Reading Time: 4 minutes In the past five years, growers across Canada have been hearing more and more about a new weed control mantra. It’s called “doing only what’s necessary.” Weeds continue to challenge and frustrate in the field, of course, and there are always new issues like resistance in species such as Canada fleabane in the East or […] Read more


Waterhemp is now resistant to seven modes of action and is also showing signs of metabolic-based resistance.

New threat to weed management

Metabolic-based resistance is setting off alarms south of the border. There won’t be any easy answers

Reading Time: 6 minutes Here in the 2020s, herbicide resistance seems just part of the reality of managing weeds. It’s certainly not a new topic. We faced resistance to atrazine in the 1970s, then Group 2 ALS inhibitors in the 1990s and a more recent, widespread resistance to glyphosate. But of course the resistance threat keeps getting more complicated: […] Read more

These thriving kochia plants are probably resistant to more than one herbicide mode of action.

Using a multi-prong strategy against herbicide resistant weeds

There are more pre-seed control options available to suppress herbicide-resistance, but use cultural management as well

Reading Time: 4 minutes More than half of western Canadian fields under annual crop production contain at least one herbicide-resistant biotype, according to surveys from 2014 to 2017. In Alberta, roughly 60 per cent of fields surveyed have resistant weeds; in Saskatchewan that figure is 57 per cent and in Manitoba it’s 68 per cent. “The surveys have been […] Read more


Canada fleabane rosette during October.

Pest Patrol: Management practices that controlled glyphosate-resistant weeds in 2020

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Several Ontario agronomists recently shared their most successful strategies for managing glyphosate-resistant weeds. Four general strategies were identified: 1. Inclusion of winter wheat in the crop rotation By early spring, winter wheat’s dense ground cover does not provide a good environment for annual weeds, like waterhemp, to germinate. There are also many herbicides that are […] Read more

(File photo by Dave Bedard)

German cabinet approves legislation to ban glyphosate from 2024

Law would still need parliamentary approval

Reading Time: < 1 minute Berlin | Reuters — Farmers in Germany will have to gradually reduce their use of glyphosate and stop using it completely from 2024 in order to preserve clean habitats for insects, under draft legislation passed by the country’s cabinet on Wednesday. “The exit from glyphosate is coming. Conservationists have been working toward this for a […] Read more