Common ragweed is one of the most abundant weeds found in farmers’ fields in southern and southwestern Ontario. It was even ranked as Ontario’s worst weed in a University of Guelph poll.1 This populous annual broadleaf has also begun to show increased herbicide resistance in Ontario with Group 2-, 5- and glyphosate-resistant biotypes confirmed in 2012. If left untreated common ragweed can reduce soybean yields by up to 70%.
Since common ragweed is a prolific reproducer, getting an early handle on it with a pre-emergent herbicide is important for long-term success. A single plant of common ragweed can produce up to 62,000 seeds. These seeds can also survive for a couple years in the soil before deciding to germinate. That is why a multi-year, multi-pronged approach is your best bet to reduce the seed bed.
Managing Common Ragweed
If you are growing IP soybeans and looking for exceptional control of ragweed from a single solution, look no further than Nufarm’s TriActor® pre-emergent herbicide. In a multi-year study by the Ontario Ministry of Agriculture, Food and Rural Affairs, TriActor provided 94% control of ragweed in IP soybeans.2 See the chart below that highlights the different herbicide treatments and the percentage control on common ragweed in IP soybeans.
TriActor is the best pre-emergent herbicide for IP soybeans because it provides three different active ingredients and three different modes of action. It also manages glyphosate-resistant common ragweed along with many other tough broadleaf and grass weeds.
With up to 8 weeks of extended control, common ragweed doesn’t stand a chance with TriActor. Take a stand now against this prolific weed. Not only will you get better yields, but you will also help reduce hay fever. The allergy sufferers will thank you, and more importantly so will your IP soybean crop.
- OMAFRA multi-year trial summary – Mike Cowbrough Provided to Nufarm in 2015