GFM Network News


Figure 1. Hairy galinsoga seedling.

Pest Patrol: More and more hairy galinsoga

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Q: I’m seeing more of a weed called hairy galinsoga, and I’m struggling to control it. Any suggestions? A: Historically, we have found this annual plant mainly in horticultural crops throughout the southern portion of the province, but in the last five years, there have been more inquiries on managing hairy galinsoga in field crops. […] Read more

Figure 4: Waterhemp in soybean.

Pest Patrol: Dealing with waterhemp and Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes In last month’s #PestPatrol, we discussed options for the control of glyphosate-resistant waterhemp. However, across the province, there appears to be a more immediate threat for the 2020 season from glyphosate-resistant Canada fleabane. This article will focus on management strategies to control both species at the same time. It is true that glyphosate-resistant Canada fleabane […] Read more


AAFC tests have been on a pull-type Harrington Seed Destructor, but a newer version is integrated with the combine.

Weed control from the back of the combine

Prairie manufacturers are offering chaff collectors, and AAFC continues tests with the Harrington Seed Destructor

Reading Time: 4 minutes Mechanical weed control hasn’t been widely adopted in Western Canada but it soon will be, says Trevor Thiessen of Redekop Manufacturing in Saskatoon. “We don’t have the same stress on the resistance issue that other parts of the world are seeing. In Canada, we’re five years behind Australia in terms of thinking about mechanical weed […] Read more

Figure 1: Purple deadnettle in a wheat field — October 2018 at a yield-reducing population density of around 500 plants per square metre.

PHOTOS: Pest Patrol: Purple deadnettle and henbit control in winter wheat

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Q: I’m seeing more henbit and/or purple deadnettle in my winter wheat crop. Should it be controlled, and how? A: Henbit and purple deadnettle are often discussed interchangeably because they look similar, are from the same genus (Lamium) and have similar emergence patterns (mainly in the fall, but henbit will also emerge in spring). Both […] Read more


Pre-harvest intervals can vary greatly between products so producers must know and adhere to intervals for each product applied to a crop.

Avoiding chemical residues now just two clicks away

Reading Time: < 1 minute Producers can ensure the chemical sprayed on their canola or pulses won’t leave unacceptable residues by adhering to the pre-harvest interval — or PHI — found on the product’s label. Often referred to as the “spray to swath” interval, the PHI is the number of days that must pass between spraying pesticides or desiccants and […] Read more

Several factors relating to water quality can affect product performance in the field, often to the detriment of the crop.

Keep an eye on water quality

Water can play havoc with spray performance, especially with the rise in tank mixing

Reading Time: 5 minutes The 2019 growing season is now within sight and with it, another season’s worth of herbicide, fungicide and insecticide applications. Given the challenges that can arise with sprayers and their products, it’s worth revisiting the subject of water quality and the potential impact of factors such as temperature, hardness and pH on product performance. With […] Read more


The choice is simple: spend an hour cleaning equipment or a more expensive hour in the field spraying.

Hitchhiking pests

Yes, cleaning out equipment takes time, but it’s worth it

Reading Time: 6 minutes When it comes to discussing the scourge of weed management in Eastern Canada, much of the light has shone on herbicide-resistant Canada fleabane and its spread from Essex County to the Quebec border in just five years. The latest weed species that is cause for concern is common waterhemp. It’s been the topic of conversation […] Read more

Second U.S. jury finds Bayer’s Roundup caused cancer

Reading Time: 3 minutes Reuters — A U.S. jury on Tuesday found Bayer’s glyphosate-based Roundup herbicide caused cancer, a blow to the company eight months after another jury issued a US$289 million verdict over similar claims in a different case. Tuesday’s unanimous jury decision in San Francisco federal court, which came after five days of deliberation, was not a […] Read more


Colombian president defends use of glyphosate on coca crops

Reading Time: 2 minutes Bogota | Reuters — A judicial ban on aerial spraying of glyphosate herbicide to eliminate coca crops should be modified, Colombia’s President Ivan Duque said on Thursday, because expansion of the crop since the ban threatens peace efforts. The Andean country suspended aerial fumigation of coca, the raw ingredient in cocaine, with the Monsanto herbicide […] Read more

Figure 4: A close up of foliar leaf burn from ATS and herbicide applications in 2018.

Pest Patrol: Questions about sulphur deficiency

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes I’m asked if growers can mix ammonium thiosulphate (ATS) with herbicides and fungicides to address sulphur deficiency symptoms, or should they apply it separately with streamer nozzles? With reductions in atmospheric sulphur deposits, Ontario research has found significant sulphur responses (10-14 bu./ac.) on some fields, while others have shown little or no response, especially where […] Read more