Drummond's Goldenweed and Its Control with Herbicides

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Abstract
Several selective and nonselective foliar-active herbicides were applied alone and in 1:1 combinations as broadcast sprays in the spring for control of Drummond''s goldenweed on the Coastal Prairie of Texas [USA]. Picloram at 0.56 kg/ha or picloram plus 2,4,5-T, glyphosate or atrazine plus paraquat at 1.12 kg/ha consistently controlled the weed. Atrazine and 2,4-D, applied singly or in combination at 1.12-2.24 kg/ha total herbicide, effectively controlled Drummond''s goldenweed only when soil-water content was high. Dicamba, like 2,4-D, was effective when applied in a wet year but not in a dry year. The effective herbicides controlled Drummond''s goldenweed for at least 3 yr. Although Drummond''s goldenweed is morphologically similar to common goldenweed, it is apparently more susceptible to herbicides than its western counterpart.

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