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Deposition and Air Concentrations of Permethrin and Naled Used for Adult Mosquito Management

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Abstract

One of the most effective ways of managing adult mosquitoes that vector human and animal pathogens is the use of ultra-low-volume (ULV) insecticides. Because of the lack of environmental fate studies and concerns about the safety of the insecticides used for the management of adult mosquitoes, we conducted an environmental fate study after truck-mounted applications of permethrin and naled. One hour after application, concentrations of permethrin on cotton dosimeters placed at ground level 25, 50, and 75 m from the spray source were 2, 4, and 1 ng/cm2 in 2007 and 5, 2, and 0.9 ng/cm2 in 2008, respectively. One hour after application, concentrations of naled 25, 50, and 75 m were 47, 66, and 67 ng/cm2 in 2007 and 15, 6.1, and 0 (nondetectable) ng/cm2 in 2008, respectively. Deposition concentrations 12 h after application were not significantly different than 1 h after application for permethrin and naled either year. During 2007 and 2008 permethrin applications, two quantifiable air concentrations of 375 and 397 ng/m3 were observed 1 h after application. In 2007 and 2008, naled air concentrations ranged from 2300 to 4000 ng/m3 1 h after application. There were no quantifiable air concentrations between 1 and 12 h after application in either 2007 or 2008 for both naled and permethrin. Environmental concentrations observed in this study demonstrate that models used in previous risk assessments were sufficiently conservative (i.e., the models overestimated environmental concentrations). However, we also demonstrate inadequacies of models such as AgDrift® and AGDISP, which currently are used by the US Environmental Protection Agency to estimate environmental concentrations of ULV insecticides.

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Acknowledgments

We thank R. Arkoudas and M. Mazzarelli (Cascade County Weed and Mosquito Control District), H. Hickes, A. Schaner, and J. Verreth (Montana State Department of Agriculture’s Chemical Analytical Laboratory), P. Connelly and B. Feiler (AMVAC Corp.), and J. Paige (Bayer Environmental Sciences). This research was supported by the US Armed Forces Pest Management Board’s Deployed War Fighter Protection Program and the Montana Agricultural Experiment Station, Montana State University, Bozeman, Montana, USA.

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Correspondence to Jerome J. Schleier III.

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Schleier, J.J., Peterson, R.K.D. Deposition and Air Concentrations of Permethrin and Naled Used for Adult Mosquito Management. Arch Environ Contam Toxicol 58, 105–111 (2010). https://doi.org/10.1007/s00244-009-9353-4

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