Predicting the Fate of Imidacloprid in a Coastal Plain Setting Using VS2DT


Proceedings of the 1997 Georgia Water Resources Conference, March 20-22, 1997, Athens, Georgia.Imidacloprid has been shown to control pine tip moths (Rhyacionia spp.) in loblolly pine seedlings (Pinus taeda L.). We describe an imidacloprid dissipation study on a small watershed near Downs, Georgia. Field data are utilized to calibrate the computer model VS2DT (Variably Saturated 2- Dimensional Transport) that uses a fmite-difference approximation of the advection-dispersion equation to simulate contaminant transport through variably saturated porous media. The site is simulated in a vertical cross section (X-Z plane) of a treated watershed from the soil surface to the water table (approximately 60 ft) spanning 260 ft horizontally. The cross section is centered on an ephemeral stream which drains the watershed, but for symmetry reasons, only half (130 ft horizontal distance) of the cross section is modeled. Modeling results show that imidacloprid moves more rapidly through sandy soils than sandy clay loam soil material. No imidacloprid concentrations above the detection limit of 0.6 ppb are predicted for the lysimeters in the unsaturated zone or in groundwater.Sponsored and Organized by: U.S. Geological Survey, Georgia Department of Natural Resources, The University of Georgia, Georgia State University, Georgia Institute of TechnologyThis book was published by the Institute of Ecology, The University of Georgia, Athens, Georgia 30602 with partial funding provided by the U.S. Department of Interior, Geological Survey, through the Georgia Water Research Institutes Authorization Act of 1990 (P.L. 101-397). The views and statements advanced in this publication are solely those of the authors and do not represent official views or policies of the University of Georgia or the U.S. Geological Survey or the conference sponsors

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