Last fall, a patch of cogongrass was discovered in Winston County. Previous infestations of cogongrass had been controlled, and to our knowledge, the county was cogongrass-free. With this new discovery of cogongrass, we could no longer make that claim. As a cooperative effort, the Winston County Natural Resources Council, the Winston County Commission, and the Winston County Extension Office decided to conduct a demonstration about controlling cogongrass.
A 1% solution of imazapyr (Arsenal), was sprayed on the congongrass with a backpack sprayer on October 10, 2007. Because it was so close to winter, the we were not able to tell if the application had been effective. This spring the cogongrass did not leaf out, and in late summer, it was obvious it was dead. Here are some before and after photos.
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