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Common Ragweed Pays Soybeans an Unwelcomed Visit

July 27, 2016

It’s that time of year again – when the unwanted common ragweed can make an appearance in soybean fields at a crucial stage of development. This difficult summer weed is known for causing damage to soybeans, corn and other crops each growing season.

Once rooted, ragweed can grow up to 6 feet tall with a span of 4 inches across. Michigan State University research has shown a yield decrease up to 30 percent at a density of just two plants per 10 feet of row.

With the development of herbicide resistance in ragweed species, growers may see weed escapes later in the season despite a pre-emergence application. At this point in the season, soybean growers can’t afford to let ragweed take over. Right now, growers should be focusing on post-emergence applications to control ragweed if they see weed escapes in their fields.

Syngenta offers Flexstar® GT 3.5 herbicide as a post-emergence option to help protect weeds that are difficult to manage with glyphosate alone or are resistant to glyphosate and ALS-inhibitors. It contains two leading active ingredients, glyphosate and fomesafen, delivering two different modes of action. Flexstar GT 3.5 provides sustainable control of tough weeds throughout the growing season.

A two-pass program, consisting of pre- and post-emergence herbicides, offers the most thorough weed management strategy. Taking proactive measures and monitoring treatments throughout the season can help maximize yield and profit potential.

Learn more about common ragweed management to help your soybeans grow strong.

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