Amblyomma americanwn: Area Control of Overwintered Nymphs and Adults in Oklahoma with Acaricides12

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Abstract
Overwintered populations of free-living nymphs and adults of Amblyomma americanum (L.) in Oklahoma were treated with sprays (bulk rate of 47–77 liters/ha) of permethrin, propoxur, diazinon, and naled and with concentrated (14%) granules of diazinon during May and June of 1977, 1978, and 1979. Chlorpyrifos and stirofos were used as standards for comparison. The effects of the treatment control were measured with a Dry Ice® sampling method for 6 weeks posttreatment. Probit analysis of the 6 week dose-control data indicated that 90% effective doses (ED90) for sprays of permethrin, propoxur, diazinon, and naled were 0.17, 0.48, 0.72, and 0.87 kg AI/ha, respectively, and for diazinon granules were 0.98 kg AI/ha. Chlorpyrifos and stirofos were shown to be 85% effective at labeled rates of 0.28 and 1.1 kg AI/ha, respectively.

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