GFM Network News


Figure 1. Dog strangling vine along a roadside in York Region where it is creeping into the fenceline and bordering corn field.

Pest Patrol: Dog strangling vine control with herbicides

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes An invasive perennial weed from the milkweed family, dog strangling vine is extremely difficult to control once it gets established (Figure 1 at top). Progress has been made on biological control of this weed in Ontario through the release of Hypena opulenta, a leaf-feeding caterpillar. However, integrated strategies that include both biological and chemical methods […] Read more

A sight no one wants to see in soybeans: cupping of the leaves caused by dicamba.

U.S. legal system helps weeds win

Luckily, Canadian producers are still outside the reach of the Ninth Circuit Court ruling on dicamba-based herbicides

Reading Time: 5 minutes In farming circles, the term “less-forgiving” has become more than a cliché. It’s now a mirror on reality. Farmers are already dealing with an incredible list of challenges and complexities, including everything from new seed technologies, concerns about land costs, equipment decisions, commodity markets, trade issues… you name it. Now growers in the U.S. must […] Read more


Keeping the corn plant weed and stress free early allows the plant to form a larger cob, up to its genetic potential.

Focus on the ear leaf in corn production

Keeping the corn plant weed and stress free early allows the plant to form a larger cob, up to its genetic potential

Reading Time: 6 minutes It seems every growing season brings something new for growers to manage. Sometimes it’s a new disease or its anticipated arrival. Other years, it’s learning to cope with the impact of weather conditions, or a sudden weed flare-up. It’s a testament to modern agricultural science that the more we learn, the more questions we ask. […] Read more

Waterhemp towers above a soybean canopy.

Pest Patrol: How accurate are plant identification apps when it comes to weeds?

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes Recommendations for plant identification apps were recently making the rounds on social media. Of course it would be nice to accurately identify an unknown weed in your field by taking a picture instead of sending it to an “expert” or a diagnostic lab. However, many of the top-rated plant identification apps are not particularly accurate […] Read more


Figure 1: The untreated control plot.

Pest Patrol: The latest word on nipplewort in cereals

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Here’s a question in my in-box. “I have a customer with a no-till rotation that has nipplewort — a lot of it. We found some pretty decent options for most crops in the rotation to clean it up before planting, but he’s got some in his wheat this year too. “What would be our best […] Read more

Weed control with Authority Supreme (Groups 14 and 15), notice that overall weed control is good with the exception of Canada fleabane.

Pest Patrol: Weed control in IP soybeans

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 2 minutes For more than a decade now, the University of Guelph and OMAFRA have been comparing the level of weed control, crop safety and grain yield associated with different herbicide programs in food grade, non-GMO soybeans, otherwise known as IP (identity preserved) soybeans. Table 1 (see below) summarizes the weed control and crop injury achieved with […] Read more


The Dot A-U1, during a field demonstration at Canada’s Outdoor Farm Show, in September 2019.

Robotic weed management takes to the fields

The potential for cost savings and precise control is enormous

Reading Time: 6 minutes Extraordinary. Revolutionary. Game-changing. Those are just some of the adjectives being used to describe robotic weed management, a technology that is generating considerable anticipation based on the initial research into its benefits in a row-crop environment. The list of key players and systems includes WEEDit, Xarvio, Bosch, Agrifac and Einböck. And the potential is large […] Read more

Figure 1. Canada fleabane leaf injury caused by 28 per cent UAN.

Pest Patrol: Using 28 per cent to manage Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes I’m thankful that farmers and agronomists share their ideas, experiences and questions with me as it relates to killing weeds. During the winter months I’ll test out ideas in the greenhouse to see if they’re worth taking to the field. I’m fortunate that we have some great public-sector researchers (such as Dr. Page, Dr. Sikkema […] Read more


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 1: Unsprayed control.

Controlling scentless chamomile with herbicides

#PestPatrol with Mike Cowbrough, OMAFRA

Reading Time: 3 minutes Several herbicide treatments were evaluated in a 2019 on-farm research trial to determine best management options for scentless chamomile, a weed with a reputation for being difficult to control. Although 10 treatments provided greater than 80 per cent visual control of emerged plants, new seedlings continued to emerge several weeks after application, resulting in a […] Read more