Susceptibility of the Cayenne Tick to Acaricides12

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Abstract
Engorged females of Amblyomma cajennense (F.) were dipped in emulsions, suspensions, or solutions of 27 acaricides, and effects on estimated reproduction (ER) were determined; ER = (grams of eggs/grams of ♀♀) × estimated percent hatch × 20,000. Percent inhibition of ER was analyzed by log-probit method. Effectiveness of acaricides ranged from that of chlorfenvinphos with a 50% inhibition of reproduction (IC50) of 0.000324% to that of DDT with an IC50 of 2.79%. Rankings of effectiveness of acaricides by IC50 and IC90 values against A. cajennense were highly significantly correlated with rankings of the same acaricides tested by the same technique against A. Americanum (L.), Anocentor nitens (Neumann), Boophilus annulatus (Say), B. Microplus (Canestrini), and Dermacentor albipictus (Packard).

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