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Abstract
Herbicidal efficacy of 0%, 1%, 4%, 7%, and 10% Roundup incorporated in carboxymethyl cellulose (CMC) and starch-grafted polymer (SGP) gels was evaluated after topical application (2 ml gel/plant) to leaves of Canada thistle, field bindweed, and Japanese honeysuckle. Increasing Roundup concentration caused a quadratic injury rating response in Canada thistle, with 7% Roundup giving maximal injury. Complete shoot necrosis and minimal regrowth of field bindweed resulted from 4%, 7%, or 10% Roundup. Injury ratings in Japanese honeysuckle increased linearly with increasing Roundup concentration, although no concentration gave complete control with one application. After a 2nd application, complete shoot necrosis occurred in only 50% of the plants treated with 10% Roundup. Although efficacy of gel-incorporated Roundup was not appreciably affected by gel type, SGP shelf life at room temperature was superior to that of CMC.