Using Post-Emergent Herbicides To Control The Cool Season Invasive Perennial Amelichloa Clandestine



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Mexican needlegrass is an invasive cool season perennial grass that has formed a dense monoculture in Concho County, Texas. Once established, Mexican needlegrass is difficult to manage because it’s drought hardy and can survive in multiple soil types. Management strategies for Mexican needlegrass in Texas are not well known. Three herbicide treatments, Pastora, Esplanade, Roundup, and a control, were applied in February with three replications per treatment in order to test the efficacy of herbicides and to monitor species composition changes after the control of Mexican needlegrass. Applications of Roundup and Esplanade resulted initial topkill of Mexican needlegrass, but resprouting occurred on several plants 7 months after spraying. There was a trend that Roundup had higher mortality rates compared to Esplanade and Pastora. All herbicide treatments reduced above ground forage production of Mexican needlegrass. Above ground forage production of Texas wintergrass and warm season grasses increased after herbicide applications.



Mexican needlegrass, herbicides, Roundup, Esplanade, Pastora