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Title: Mesocosm evaluation of bensulfuron methyl activity on Eurasian Watermilfoil, Vallisneria, and American Pondweed
Authors: Aquatic Plant Control Research Program (U.S.)
Getsinger, Kurt D.
Dick, Gary Owen, 1956-
Crouch, R. Michael.
Nelson, Linda S.
Keywords: Chemical control
Bensulfuron methyl
Aquatic plants
Myriophyllum spicatum
Potamogeton nodosus
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: Concentration/exposure time relationships for the compound bensulfuron methyl (methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]-carbonyl]amino]sulfonyl]methyl]benzoate) against Eurasian watermilfoil (Myriophyllum spicatum L.), vallisneria (Valllsnerla americana Michx.), and American pondweed (Potamogeton nodosus Poiret) were evaluated in a large outdoor mesocosm system. Initial treatment rates ranged from 25 to 100 μg/L, and plants were exposed for a 12-week period. Estimates of plant control were based on weekly measurements of shoot height, biomass harvested at 6 and 12 weeks posttreatment, and regrowth of root crowns following removal from herbicide-treated conditions. Biomass of Eurasian watermilfoil averaged approximately 50 percent less than that of untreated references after 6 weeks exposure to all treatments. At 12 weeks exposure, Eurasian watermilfoil biomass was reduced 96 to 98 percent compared to untreated references at all chemical rates tested. Shoot height of untreated Eurasian watermilfoil had reached the water surface (100 cm), but averaged less than 20 cm in height in all bensulfuron methyl treatments. Vallisneria and American pondweed exhibited greater than 95 percent reduction in biomass at all chemical rates tested compared to untreated references at 12 weeks posttreatment. Shoot heights of vallisneria and American pondweed were reduced greater than 90 percent at all bensulfuron methyl treatment rates compared to untreated references. When removed from herbicide-treated conditions, some root crowns from all species initiated regrowth. After 12 weeks exposure, results show that bensulfuron methyl contact time may be more important than rate of application for controlling the species tested.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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