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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.
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September 14, 2020