Perennials such as dandelions and Canada thistle are best controlled in fall with a pre- or post-harvest application.
For spring applications, tank-mixing glyphosate with a pre-seed product can help you get the best control while also using a reduced rate. Majority of products are registered to be tank mixed with glyphosate at 0.5 REL and control tough to kill weeds that usually require a higher application. For example, applying florasulam + glyphosate at 0.5 REL in front of cereals controls large dandelions whereas spraying glyphosate alone would require rates up to 1.5 REL.
Adding a tank mix partner with glyphosate not only aids in weed control (especially on those that glyphosate may be weak on, such as wild buckwheat and dandelions), but it also controls round-up ready volunteers and combats resistance. Although glyphosate is considered in the low-risk category for herbicide resistance, it does occur. This is due to the adoption of zero-till, multiple applications in a season (pre-seed, pre-harvest, post-harvest) and glyphosate resistant crops. In Canada, there are currently six glyphosate resistant weeds (giant ragweed, Canada fleabane, common ragweed, waterhemp, kochia and downy brome), two of which occur in Manitoba (waterhemp, kochia). It is also likely that wild oats will develop glyphosate resistance in the future. In order to combat resistance, both modes of action need to act on the same weed.
Here at Prairie Giants Crop Supply, we are a Defy Resistance Headquarters – your one-stop shop for dealing with herbicide resistance. Click the link (https://www.defyresistance.com/) to check out the site for more resources including a Resistance Guide.
Reach out to the crew at Prairie Giants with any questions on how we can help to get the most
out of your glyphosate application!