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Category: Weeds

How do I control bluegrass in winter wheat?

Posted on March 29, 2022 (April 8, 2022) by Mike Cowbrough

Bluegrass competition in winter wheat can result in yield losses of up to 50%. We reviewed current research to provide recommendations for reliable control of annual and roughstalk bluegrass in Ontario. […]

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Optimizing the performance of glyphosate in field crops

30" soybean
Posted on March 27, 2022 (July 18, 2022) by Mike Cowbrough

Reduced supply and increased costs of glyphosate have prompted many to reevaluate how they use this herbicide. The following three questions are most common: […]

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Phragmites control with herbicides and biological agents

Posted on October 28, 2021 (November 12, 2021) by Mike Cowbrough

This post provides an overview of the research that has been done in Ontario to evaluate the control of phragmites with herbicides. […]

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Dog Strangling Vine Control with Herbicides

Posted on December 16, 2020 (January 25, 2022) by Mike Cowbrough

  An invasive perennial weed from the milkweed family, dog strangling vine, is extremely difficult to control once it gets established (Figure 1). 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 […]

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Ontario Weed Committee

Ontario Weed Committee
Posted on October 29, 2020 (October 29, 2021) by Mike Cowbrough

This post contains all information related to the Ontario Weed Committee […]

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Pre-Harvest Herbicide Timing in Soybeans

Posted on September 16, 2020 (December 22, 2021) by Mike Cowbrough

A pre-harvest herbicide treatment can make harvest more efficient when there are an unacceptable number of weeds in a soybean crop. Both conventional and glyphosate tolerant fields that are weedy can benefit from a pre-harvest herbicide. Drier plant matter will pass more easily through the combine, lowering seed losses and reducing seed staining… […]

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Waterhemp: biology and control

A ten-leaf hairless seedling plant with narrower, wavy margined leaves compared to other pigweed species.
Posted on July 10, 2020 (July 4, 2022) by Mike Cowbrough

This post will serve as a repository for all information associated with the management and control of waterhemp in Ontario. […]

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Mixing “ATS” with herbicides: The importance of a “jar test”

An attempted jar test mixing of Liberty 200 SN with ATS as a carrier, resulting in unacceptable mixing.
Posted on May 3, 2020 by Mike Cowbrough

Each year I get more questions about mixing the liquid fertilizer, ammonium thiosulphate (ATS) with herbicides. With reductions in atmospheric Sulphur deposits, Ontario research has shown positive yield responses in some crops when Sulphur fertilizers are applied and so it makes sense that farmers are looking at ways to add Sulphur to their crop in […]

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Controlling Scentless Chamomile with Herbicides

Posted on April 1, 2020 (April 23, 2020) by Mike Cowbrough

Scentless chamomile has a reputation for being difficult to control and a 2019 on-farm research trial evaluated several herbicide treatments. Although 10 treatments provided over 80% visual control of emerged plants, new seedlings continued to emerge several weeks after application resulting in a significant amount of plants at the end of August. In order to […]

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Wild carrot biology and control

a picture of a soybean field where a strip of wild carrot was left un-sprayed on the left, while the right hand side received a pre-plant application of Guardian herbicide.
Posted on February 21, 2020 (April 21, 2020) by Mike Cowbrough

The following link will take you to a .pdf version of the wild carrot chapter from the book entitled “Problem Weed Guide for Ontario Crops – Volume 1” […]

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What’s Working on the Farm? Practical Solutions for Problem Weeds

Posted on March 22, 2019 (March 18, 2019) by Mike Cowbrough

  “Do not be cheap. Weed control is an investment into the current and future crops on every field.” That was parting advice from Norfolk and Oxford County farmer Ann Vermeersch at the 2019 FarmSmart Conference in Guelph. In front of 80 farmers and agronomists, I moderated a session with Vermeersch and Steph Kowalski, a […]

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Managing Glyphosate Resistant Canada Fleabane with Cover Crops and Tillage

Posted on November 20, 2018 (November 19, 2018) by Mike Cowbrough

My colleague Dr. Clarence Swanton (University of Guelph) used to say that based on research he did in the 1980’s, one should not expect to control weeds with cover crops. Their utility was in preventing soil erosion and improving soil health but not in significantly reducing weed populations. However, Dr. Swanton has had to re-think […]

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Guide to Weed Control in Field Crops – Pub 75A

Posted on May 17, 2018 (April 16, 2020) by Mike Cowbrough

The OMAFRA Guide to Weed Control for Field Crops (Publication 75A) is available in the following formats: ELECTRONIC ENGLISH VERSION (PDF): click to download ELECTRONIC FRENCH VERSION (PDF): click to download PRINT VERSIONS: Go to Publications Ontario and search the term “Guide to Weed Control” […]

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Common ragweed: biology and control

Posted on October 28, 2017 (July 11, 2020) by Mike Cowbrough

The latest best management practices for common ragweed competing in corn, soybean and winter wheat can be found here: Common ragweed control (Source: Problem Weed Guide for Ontario Crops) […]

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Corn – 2,4-D or not 2,4-D? Situational with Sikkema

Posted on April 18, 2017 (April 12, 2017) by Ridgetown Campus Weed Research

In, Dealing with Escapes – What will they cost you? , we discussed late emerging weeds and their effect on corn yield.  We also discussed some points to consider beyond the effect the weeds will have on yield and why you might consider a post application.  A post-emergence application can provide you with the opportunity to control […]

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