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. […]
Reduced supply and increased costs of glyphosate have prompted many to reevaluate how they use this herbicide. The following three questions are most common: […]
This post provides an overview of the research that has been done in Ontario to evaluate the control of phragmites with herbicides. […]
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 […]
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… […]
This post will serve as a repository for all information associated with the management and control of waterhemp in Ontario. […]
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 […]
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 […]
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” […]
“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 […]
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 […]
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” […]
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) […]
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 […]
