Reduction of the Amblyomma americanum (Acari: Ixodidae) population at Fort A.P. Hill, Virginia, by aerial application of diazinon granules: correlation of percentage control with received dose.

Habitat (280 ha) of lone star tick, Amblyomma americanum (L.), was aerially treated with 14% diazinon granules. Concentration of acaricide reaching the forest floor ranged from 0.02 to 1.25 kg (AI)/ha. Greater than 85% control was achieved at study plots receiving the highest dose. A positive correlation was shown between dose received at the forest floor and percentage of control of adults (r = 0.91) and nymphs (r = 0.86).