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Increasing cases of herbicide resistance are driving growers to adopt alternative weed management tactics. Cover crops are one of these tactics. Horseweed is a problematic weed in Virginia. Winter cover crops have a unique ability to suppress horseweed during both of its germination periods, both fall and spring. Research was conducted to determine if cover crops, alone or in mixtures, can suppress horseweed. Cover crops, all monocultures and mixtures, excluding forage radish, which winterkilled in our study, suppressed cover crops. This research indicates that cover crops can be used to suppress horseweed early in the cash crop season and that growers can incorporate legumes into cereal rye mixtures to gain the benefits of a legume without sacrificing weed suppression.
Virginia Cooperative Extension materials are available for public use, reprint, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.
Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; M. Ray McKinnie, Administrator, 1890 Extension Program, Virginia State University, Petersburg.
August 21, 2019