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Title: Persistence of dichlobenil in Lake Seminole, Georgia
Authors: Green, W. Reed
Westerdahl, Howard E.
Keywords: Aquatic plant management
Aquatic plant control
Seminole, Lake (Ga. and Fla.)
Eurasian watermilfoil
Aquatic Plant Control Research Program (U.S.)
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Miscellaneous Paper (Aquatic Plant Control Research Program (U.S.)) ; no.Miscellaneous Paper A-88-6
Abstract: Dichlobenil is a herbicide being considered for use in large aquatic systems for control of submersed plants. Granular formulations of dichlobenil are incorporated in the sediment, causing injury and death in young germinating plants. The persistence of dichlobenil was evaluated in the water and sediment of eleven 0.4-ha plots in Lake Seminole, Georgia, in June 1986. Dichlobenil residue concentrations within the treated water column were found to have a half-life of between 7 and 9 days. Concentrations were greatest between 1 and 5 days posttreatment and dissipated by 21 days postreatment. Dichlobenil residue concentrations in the sediment were found to have a half-life of between 16 and 28 days. Concentrations were greatest immediately after treatment and dissipated by 55 days posttreatment in half of the plots and by 104 days posttreatment in the remaining plots. Dichlobenil appeared to impair the vegetative regrowth and reinfestation of hydrilla and watermilfoil following chemical defoliation of the mature vegetative standing crop with endothall. The relatively low dichlobenil residue concentrations in the water and the persistence characteristics in both the water and sediment suggest that the operational use of dichlobenil for control of submersed aquatic plants will not cause harm to associated nontarget organisms.
Description: Miscellaneous Paper
Gov't Doc #: Miscellaneous Paper A-88-6
Rights: Approved for public release; distribution is unlimited
Appears in Collections:Miscellaneous Paper

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