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Hydrilla control with split treatments of fluridone in Lake Harris, Florida

After several unsuccessful management efforts, a split treatment of fluridone was applied to the 6700 ha Lake Harris in March and June 1987, at a rate of 3.4 kg/ha (680 and 340 kg fluridone, respectively) to two 3 m deep, hydrilla-infested bays. Fluridone concentrations in the water were sampled fol...

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Bibliographic Details
Published in:Hydrobiologia 1996-12, Vol.340 (1-3), p.235-239
Main Authors: FOX, A. M, HALLER, W. T, SHILLING, D. G
Format: Article
Language:English
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Summary:After several unsuccessful management efforts, a split treatment of fluridone was applied to the 6700 ha Lake Harris in March and June 1987, at a rate of 3.4 kg/ha (680 and 340 kg fluridone, respectively) to two 3 m deep, hydrilla-infested bays. Fluridone concentrations in the water were sampled following the June treatment. Average fluridone concentrations were 2.1 mu g/l prior to this second application, and a maximum concentration of 30.2 mu g/l was detected in the treated area on the day following application. Fluridone residues dissipated out of the plot quickly due to dilution but concentrations declined lake-wide more slowly, following a logarithmic model, with an estimated fluridone half-life of 97 days. Control of hydrilla in Lake Harris resulted from the long exposure (over 25 weeks due to the split application) to fluridone concentrations of 2 mu g/l, well below the maximum labelled rate of 150 mu g/l.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00012761