Abstract
A conventional tractor-mounted mist blower was modified for ultralow-volume (ULV) application of nonaqueous formulations of chlorpyrifos for area control of the lone star tick, Amblyomma americanum (L.), in wooded plots (0.20–0.36 hal and high-use recreational areas (0.98–5.10 ha) in Oklahoma during 1981 to 1983. The construction of the mist blower for ULV application is described. Mist deposits of a red fluorescent dye indicated that uniformity of coverage over 15-m swaths with the prototype ULV mist blower was equal to that obtained with another mist blower used for low-volume (LV) application of aqueous formulations. Field assays with a dose of 0.28 kg chlorpyrifos/ha showed that ULV mists (volumes of 0.39–1.17 liters/ha) were equal to LV mists (47 liters/hal in effectiveness against ticks. The overall levels of control of ticks with ULV mists were 85% (larvae), 94% (nymphs), 90% (adult males), and 86% (adult females) for posttreatment intervals of 1 to 6 weeks (nymphs and adults) and one day to 3 weeks (larvae). Relative densities of ticks were determined by a dry ice method (nymphs and adults) and a cloth drag method (larvae).
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