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Figure 1: Unsprayed control.
Crops

Controlling scentless chamomile with herbicides

#PestPatrol with Mike Cowbrough, OMAFRA

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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
Figure 4: Waterhemp in soybean.
Crops

Pest Patrol: Dealing with waterhemp and Canada fleabane

#PestPatrol with Mike Cowbrough, OMAFRA

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

The latest on waterhemp

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

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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
As much as companies have been communicating on stewardship, there are still issues in using newer technologies.
Crops, Soybeans

Are crop trait technologies simplifying your life, or complicating it?

Deciding how to use the technologies can turn into more of a challenge than deciding which of them to use

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Reading Time: 6 minutes The arrival of a new herbicide-resistant technology is often greeted as an opportunity for growers and the industry. That isn’t really new. Roughly 30 years ago, Group 2 herbicides solved the problem of atrazine resistance, then LibertyLink and Roundup Ready technologies enabled growers to push beyond Group 2 resistance. Now that Xtend and Enlist systems […] Read more
Figure 1: Light green waterhemp plants approaching the top of the soybean canopy after two applications of glyphosate that proved ineffective. At this stage, no herbicide will adequately control waterhemp.
Crops

Pest Patrol: Plan to manage waterhemp in 2020

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 2 minutes Waterhemp has spread further across Ontario during the 2019 season and can now be found in eight counties (Bruce, Chatham-Kent, Essex, Haldimand, Lambton, Middlesex, Norfolk and Northumberland). A close relative of pigweed, waterhemp is a competitive annual broadleaf weed that has been found resistant in the province to four different herbicide groups (Group 9: Roundup, […] Read more
Contrast in control of Roundup Ready alfalfa with herbicides applied in early fall (foreground) compared to late fall (background).
Crops, Forages

Pest Patrol: Killing off Roundup Ready alfalfa

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 3 minutes Six tank-mix partners are recommended for the removal of Roundup Ready alfalfa, and since they vary significantly in cost (Table 1 below), their effectiveness was evaluated in a trial conducted at the Elora Research Station in 2018-19. Growing degree day accumulation after herbicide application appeared to have the greatest effect on the control of Roundup […] Read more
AAFC tests have been on a pull-type Harrington Seed Destructor, but a newer version is integrated with the combine.
Crops, Machinery

Weed control from the back of the combine

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

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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.
Crops, Winter Wheat

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

#PestPatrol with Mike Cowbrough, OMAFRA

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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.
Crops, News

Avoiding chemical residues now just two clicks away

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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
A cereal rye cover crop established after corn silage in the fall of 2018.
Crops

Pest Patrol: Planning for cover crops

#PestPatrol with Mike Cowbrough, OMAFRA

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Reading Time: 2 minutes Q: I want to plant cover crops after harvest. Should I be concerned about any herbicide residues that would make it harder to get them established? A: Two important factors influence the potential for herbicide carryover that could negatively affect establishment of a desired cover crop: The sensitivity of the cover crop to herbicide residues. […] Read more

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