Area Control of Larvae of the Lone Star Tick (Acari: Ixodidae) with Acaricides1

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Abstract
Free-living larvae of Amblyomma americanum (L.) in eastern Oklahoma were controlled by applications of acaricides during July to September 1979 and 1981. The effects of the acaricides were measured with a drag sampling method through 4 weeks posttreatment. Log-probit analysis of results indicated 90% effective doses for sprays of chlorpyrifos, diazinon, and stirofos of 0.16, 0.60, and 0.43 kg of Al/ha, respectively, and a 90% effective dose for 14% diazinon granules of 0.56 kg of Al/ha. Mean reinfestation rates at 2, 3, and 4 weeks posttreatment were 10, 19, and 34%, respectively, for all acaricides. On the basis of a larval Questing season of 60 to 90 days and larval reinfestation after 21 days, it was concluded that most larval populations could be controlled with one to three applications of acaricide.