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|Title:||Determination of chemical threshold concentrations using 2,4-D to control selected aquatic macrophytes -- a pilot study to evaluate a laboratory system|
|Authors:||Aquatic Plant Control Research Program (U.S.)|
Westerdahl, Howard E.
Hoeppel, Ronald E.
|Keywords:||Aquatic plant control|
2,4-dichlorophenoxy acetic acid
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: The objectives of this pilot study focused on the evaluation of a modified diluter system used to determine the minimum sustained (threshold) herbicide concentrations required to control nuisance aquatic macrophytes. The herbicide 2,4-dichlorophenoxy acetic acid (2,4-D) was used during this pilot study to provide data for evaluating the diluter system operation as well as to provide initial estimates of the threshold 2,4-D concentration required to control Eurasian watermilfoil (Myriophyllum spicatum L.) and Sago pondweed (Potamogeton pectinatus L.). The experimental design included three replicate aquaria containing each of the aforementioned plant species planted in beakers containing a standard hydrosoil, and one reference aquarium wi thout plants exposed for 6 weeks to each of several 2,4-D concentrations: 0.00, 0.01, 0.04, 0.10, and 0.20 mg/l. Results of this pilot study showed that the modified diluter system was completely satisfactory for this work. Moreover, estimates of the threshold 2,4-D concentrations needed to control the aforementioned plants were: 0.1 mg/l for M. spicatum, and 0.2 mg/l for P. pectinatus. These results will be verified following completion of recommended changes in the diluter system.
|Appears in Collections:||Technical Report|