Susceptibility of<i>Ixodes scapularis</i>(Acari: Ixodidae) to Permethrin Under a Long-Term 4-Poster Deer Treatment Area on Shelter Island, NY

Abstract Pesticide resistance in medically significant disease vectors can negatively impact the efficacy of control efforts. Resistance research on ticks has focused primarily species veterinary significance that experience relatively high degrees pressure. tick medical received little attention, part because area-wide pesticide applications are not used to these generalist species. One few effective methods currently for important ticks, including Ixodes scapularis Say (Acari: Ixodidae), is deployment 4-poster devices. Deer self-apply a topical acaricide (permethrin) while feeding corn from A program using permethrin been deployed Shelter Island, NY I. populations since 2008. We collected engorged female deer this management area and location Mid-Hudson River Valley, without control. Larvae were reared egg masses their susceptibility was tested. originating long-term laboratory colony as susceptible baseline comparison. Compared against colony, ratios at LC-50 Island Hudson Valley 1.87 1.51, respectively. The susceptibilities field significantly lower than ticks. provide first data larval packet test establish along with information relevant understanding emergence under sustained pressure