MKC Blog > April 2019 > Herbicide Combinations Combat Weeds

Herbicide Combinations Combat Weeds

April 8, 2019
It is no secret pigweed is one of the most troublesome of weeds. Pigweed, or palmer amaranth, has increasingly become resistant to the herbicide, glyphosate, but until recently Kansas has had no confirmed cases of resistance to 2,4-D and dicamba. With the large amount of moisture predicted throughout the spring a proper herbicide program is essential for better yielding opportunities to protect your acres.

A study released by Kansas State University Research and Extension on March 1, 2019, found palmer amaranth resistance to 2,4-D and dicamba at the Ashland Bottoms Experiment Field in southern Riley County, Kansas. The weeds were applied with the recommended rate of 2,4-D (0.5 lb. ae/a) in the summer of 2018. K-State’s Department of Agronomy then transferred the plants to a greenhouse and allowed them to set seeds for further research.

The resistant offspring were raised and compared to a susceptible set of offspring. The resistant group survived up to 16 times (8 pounds a.e./acre) dose of 2,4-D, while the susceptible plants were killed with a dose of 1-pound a.e./acre or less.

Palmer amaranth is one of the most destructive, difficult to control and economically damaging broadleaf weeds in the U.S. Palmer amaranth has developed resistance to groups 2 (ALS), 5 (atrazine), 9 (glyphosate) and 27 (hppd inhibitors such as Huskie, Callisto, and Balance Flexx) herbicides. Now it is at risk of becoming resistant to group 4 (dicamba and 2,4-D) herbicides as well.

Edited.jpgWays to Manage Weed Herbicide Resistance

Weed herbicide resistance is a constant threat to yields all over the country. One of the best approaches to managing weed herbicide resistance is by using different modes of action in your spray mixture. By using different modes of action in your tank mixture, you are inhibiting different physiological process in the plant. Making it more difficult for weeds to build resistance.

The team at MKC have statically created a few options within our corn and soybean herbicide combinations to provide multiple effective modes of action to your acres.

For corn and soybeans, MKC has combinations from Corteva Agriscience, FMC and Bayer. For example, the corn Corteva combination has Resicore (groups 15, 27, 4), Atrax 90 (group 5), Sterling Blue (group 4), Powermax (group 9) and Class Act. MKC will also do post-emergence passes with multiple modes of action.

In the combination used as an example, MKC is using multiple modes of action to prevent weed resistance and increase herbicide efficiency. By adding a water conditioner such as Class Act, the calcium carbonate in the water gets tied up, making it easier for the herbicides to kill the weeds.

With spring right around the corner, and burn-down applications happening soon, now is the time to have your weed management plan organized and in place for the upcoming season. Reach out to your strategic account manager or visit a MKC location and we will work with you to build the best possible plan for your operation.
Posted: 4/8/2019 10:01:53 AM by Mikey Hughes | with 0 comments

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