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|Title:||The 2,4-D threshold concentrations for control of Eurasian watermilfoil and Sago pondweed|
|Authors:||Aquatic Plant Control Research Program (U.S.)|
Hall, Jerry F.
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 objective of this study was to use a modified diluter system to determine the minimum sustained (threshold) concentrations of 2,4-dichlorophenoxy acetic acid (2,4-D) required to control the growth of Eurasian watermilfoil (Myriophyllum spicatum L.) and Sago pondweed (Potamogeton pectinatus L.). This study was designed to incorporate recommend ed improvements and to verify results from a previous pilot study. The diluter system delivered five different concentrations of 2,4-D to five sets of four test aquaria. Another set of four reference aquaria received only tapwater. Each aquarium contained meristematic cuttings of M. spicatum and germinated tubers of P. pectinatus planted in beakers containing a standard hydrosoil. Plant injury was assessed after 11 weeks of continuous exposure to the various 2,4-D concentrations. Based on the results of this study, the 2,4-D threshold concentrations required to control M. spicatum and P. pectinatus were determined to be 0.05 to 0.10 mg/l and 0.10 to 0.25 mg/l, respectively. This coincided with previous results obtained from a 6-week pilot study.
|Appears in Collections:||Technical Report|