Authors as Published

Kara Pittman, Extension Associate, School of Plant and Environmental Sciences, Virginia Tech; Michael Flessner, Extension Weed Science Specialist, School of Plant and Environmental Sciences, Virginia Tech; Charlie Cahoon, Extension Weed Specialist, Department of Crop & Soil Science, North Carolina State University; and Kevin Bamber, Senior Research Specialist, School of Plant and Environmental Sciences, Virginia Tech

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Cover crops have many benefits but must be managed appropriately to gain these benefits but not negatively impact following crops. For weed suppression, large amounts of biomass are important to create the mulch layer to suppress weeds. Larger plants are more difficult to control with herbicides and growers should have a plan in mind to effectively terminate their cover crop. Based on the results from this study, cereal grains, such as wheat, barley, cereal rye, and oats, and annual ryegrass will be adequately controlled by glyphosate. Herbicides needed to control the broadleaf cover crops vary by species and tankmixes with glyphosate or paraquat increase efficacy. Common cover crop mixtures in Virginia often include a grass cover crop species and a legume cover crop species. For these mixtures, tankmixes including glyphosate will provide the best control. When cover crops become too large or would be too difficult to terminate with herbicides, alternative mechanical methods should be used to ensure an adequate kill to prevent competition and seed set that will interfere with future crops.

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Publication Date

September 18, 2019