Abstract
Permethrin is one of the few active ingredients found in commercial adulticides available for adult mosquito control. The permethrin concentrations in the adulticide Aqualuer 20-20 formulation stored in the 21 ultra-lowvolume (ULV) truck-mounted spray tanks after 4, 6, and 8 months were sampled and analyzed by gas chromatography mass spectroscopy (GC-MS). Additionally, the permethrin stored in a mixing pump and a stock container were sampled and analyzed by GC-MS. The results showed that 46%, 42%, and 82%, permethrin in Aqualuer 20-20 were decomposed in the ULV spray tanks at 4--, 6--, and 8 months-storage, respectively. For the mixing pump, 17% of the permethrin in the Aqualuer 20-20 were decomposed. The storage time of permethrin in ULV spray tanks resulted in the degradation in the concentrations of permethrin after more 4 months, compared with the concentration in stock control. The degradation of permethrin in ULV spray tanks may directly impact the control efficacy for adult mosquitoes and result in an economic loss.
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More From: Journal of the Florida Mosquito Control Association
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