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Volunteer corn in soybeans can be controlledVolunteer corn in soybeans can be controlled

Bring down volunteer corn in soybeans.

Tom Bechman 1

June 6, 2012

2 Min Read

Bill Johnson's phone still rings quite frequently this time of year with calls about how to kill volunteer corn in soybeans. Usually the farmer planted Roundup Ready corn the year before. An application of glyphosate that will get other weeds won't bring down the volunteer corn.

Johnson is a Purdue University weed control specialist. He says the products of choice for bringing down volunteer corn in soybeans are two different chemistries with the brand names of Select Max and Assure. You might also consider Fusion or Fusilade.


The rate for each product varies, and is spelled out on the label, he notes. For the most part the labeled rate for the product to control volunteer corn in soybeans depends upon the size of the corn. For example, for Select Max, the label says 6 ounces of Select Max per acre for volunteer corn up to 12 inches tall, and 9 ounces per acre for corn 12-inches to 24-inchesw tall.

For Assure the label says you can apply 4 ounces per acre on volunteer corn in soybeans if the volunteer corn is up to 12 inches tall. If it is 12 to 18 inches tall, bump the rate up to 5 ounces of Assure per acre. If the volunteer corn in soybeans is 18 to 30 inches tall, go with 8 ounces of Assure per acre. If the corn is relatively thick, you're going to lost yield of soybeans to weed competition if you let it get that big. Volunteer corn in soybeans acts like a weed.

Rates are similar for both Fusion and Fusilade. Use 4 ounces per acre on corn up to 12 inches tall in soybeans, and use 6 pounces per acre of Fusion or Fusilade to control volunteer corn in soybeans if the volunteer corn is more than 12 inches tall.

Some products that are good on grasses in soybeans are not as effective on volunteer corn. For example, Poast does a good job on annual grasses but it not as effective on volunteer corn.

If the corn planted last year was non-GMO, you can control it with regular soybean postemergence grass herbicides, including glyphosate. This will also control Liberty Link corn. If the last corn crop was Liberty Link corn, Liberty won't control the volunteer corn that might be in the field.

About the Author(s)

Tom Bechman 1

Editor, Indiana Prairie Farm

Tom Bechman is an important cog in the Farm Progress machinery. In addition to serving as editor of Indiana Prairie Farmer, Tom is nationally known for his coverage of Midwest agronomy, conservation, no-till farming, farm management, farm safety, high-tech farming and personal property tax relief. His byline appears monthly in many of the 18 state and regional farm magazines published by Farm Progress.

"I consider it my responsibility and opportunity as a farm magazine editor to supply useful information that will help today's farm families survive and thrive," the veteran editor says.

Tom graduated from Whiteland (Ind.) High School, earned his B.S. in animal science and agricultural education from Purdue University in 1975 and an M.S. in dairy nutrition two years later. He first joined the magazine as a field editor in 1981 after four years as a vocational agriculture teacher.

Tom enjoys interacting with farm families, university specialists and industry leaders, gathering and sifting through loads of information available in agriculture today. "Whenever I find a new idea or a new thought that could either improve someone's life or their income, I consider it a personal challenge to discover how to present it in the most useful form, " he says.

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