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Don't Let Lambsquarters and Marestail Get Out of Control

If they're over 4 inches tall you're in for a real fight.

Tom Bechman 1, Editor, Indiana Prairie Farm

June 26, 2012

2 Min Read

Unless you're planting double-crop soybeans or replanting soybeans that died after trying to sprout in semi-dry dirt, or replanting because slugs ate up your beans in south-central Indiana, you may read this item more to understand why your lanmbsqaurters and marestail were especially hard to control this year than to do anything about helping this year's crop. There's always next year's crop you can concentrate on.

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Bill Johnson, Purdue University weed control specialist, says that farmers reported difficulty in bringing down lambsquarters and marestail in many situations in soybeans. Once they get any size, say 4 inches or more, and especially if they're stressed by drought, they're extremely tough to control, he says.

"And if they're bigger than 4 inches tall, all bets are off," Johnson says. These become very hard weds to handle."

One of Johnson's favorite comments when asked about an impossible situation si to answer that you better pray hard. A field with tall lambsquarters and marestail would fall into that category.

If you have fields that still fall into the category where you believe you can control these weeds, then give it your best shot, he says. Use the maximum rate. Check the label to see if the manufacturer calls for adding Nitrogen or a special adjuvant package if you are spraying in stressful conditions. You'e going to need to heat up the mixture to have any shot at controlling weeds once they get a head start and have that much size, he notes.

Johnson made these comments as part of a Purdue University conference call designed to inform Extension educators across the state about how to advise farmers with questions related to surviving the dry weather. Some areas of Indiana are already classified by the U.S. Drought Monitor as being in a drought category. Other areas are abnormally dry. Weed control is much tougher once weeds harden off in dry weather, Johnson concludes.

About the Author

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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