K-State Research and Extension News
October 03, 2012
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Consider Fall Bindweed Control Ahead of First Freeze


MANHATTAN, Kan. – To the uninitiated, its pretty, delicate flowers can be deceiving. But field bindweed is a deep-rooted perennial weed that severely reduces crop yields and land value, according to Kansas State University crop scientist Curtis Thompson.

The noxious weed infests just under 2 million acres across Kansas, said Thompson, who is a weed specialist with K-State Research and Extension.

“Bindweed is notoriously hard to control, especially with a single herbicide application,” he said. “In the fall prior to a killing freeze can be an excellent time to treat field bindweed especially when good fall moisture has been received. This perennial weed is moving carbohydrates deep into its root system during this period, which can assist the movement of herbicide into the root system.”

Thompson said the most effective control program includes preventive measures over several years coupled with persistent and timely herbicide applications. The use of narrow row spacing and vigorous, competitive crops such as winter wheat or forage sorghum also may aid control.

“Dicamba, Tordon, 2,4-D ester, and glyphosate products alone or in various combinations are registered for suppression or control of field bindweed in fallow and/or in certain crops, pastures and rangeland. Producers should apply each herbicide or herbicide mixture according to directions, warnings and precautions on the product label. Single applications rarely eliminate established bindweed stands,” he said.

Applications of 2,4-D ester and glyphosate products are most effective when spring-applied to vigorously growing field bindweed in mid- to full-bloom. However, dicamba and Tordon applications are most effective when applied in the fall. Most herbicide treatments are least effective when applied in mid-summer or when bindweed plants are stressed.

Paramount at 5.3 to 8.0 ounces per acre can be applied to bindweed in fallow prior to planting winter wheat or grain sorghum with no waiting restrictions, the crop scientist said. All other crops have a 10-month pre-plant interval. Paramount can be used on a sorghum crop to control field bindweed during the growing season. Fall applications of Paramount have been effective.

Additional non-cropland treatments for bindweed control include Krenite S, Plateau, and Journey.

Thompson said that a considerable amount of research has been done on herbicide products and timing for bindweed control. Although the research was conducted a few years ago, the products and timing options used for bindweed control have not changed much.

More information is available in the Sept. 28, 2012 K-State agronomy extension newsletter online at Extension Agronomy e-Updates or the 2012 Chemical Weed Control for Field Crops, Pastures, Rangeland, and Noncropland, page 121.

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K-State Research and Extension is a short name for the Kansas State University Agricultural Experiment Station and Cooperative Extension Service, a program designed to generate and distribute useful knowledge for the well-being of Kansans. Supported by county, state, federal and private funds, the program has county Extension offices, experiment fields, area Extension offices and regional research centers statewide. Its headquarters is on the K-State campus, Manhattan.

Story by: Mary Lou Peter
mlpeter@ksu.edu
K-State Research & Extension News

Curtis Thompson – 785-532-3444 or cthompso@ksu.edu