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Title: Persistence of dichlobenil in Lake Seminole, Georgia
Authors: Aquatic Plant Control Research Program (U.S.)
Green, W. Reed.
Westerdahl, Howard E.
Keywords: Aquatic plant management
Aquatic plant control
Lake Seminole
Eurasian watermilfoil
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
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.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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