Application of desiccant and insecticidal soap treatments to control Ixodes scapularis (Acari: Ixodidae) nymphs and adults in a hyperendemic woodland site.

The desiccant Drione (1% pyrethrin) and Safer's insecticidal soap (0.2% pyrethrin) formulated with and without isopropyl alcohol (ROH) were field tested against nymphal and adult populations of Ixodes scapularis Say in a hyperendemic woodlot in Westchester County, New York. Drione, insecticidal soap, and insecticidal soap with ROH provided equivalent levels of control for nymphs and adults. Compared with untreated plots, nymphal populations were significantly reduced 1 (93.3-100%) and 2 (66.4-85.7%) wk following treatment, and adult populations were significantly reduced 1 wk (53.5-62.9%) following treatment. Factors possibly contributing to the moderate and shorter period of adult control are discussed. Drione and insecticidal soap are effective alternatives to residual insecticides and could be an important component of an integrated tick management program on residential properties in areas where Lyme disease is endemic. Both products lack residual activity and would require repeated applications to maintain sufficient levels of control throughout the tick season.