ACARICIDE ACTION OF FLUAZURON, POUR-ON FORMULATION, ON THE CATTLE TICK Boophilus microplus

Abstract

Performance of Fluazuron, a tick development inhibitor was evaluated against the cattle tick Boophilusmicroplus al dosages of 1 mg/kg and 2 mg/kgthrought pour-on formulation on caule kept in field conditions, and experimentallyinfested. Results were compared with a bovine group treated with Cypermethrin and a control group. Adult females collectedin the days +2 and +4 after treatment (a. t.) did not show any morphological changes or inhibition in the development, butfemales between +7 and +35 days a. t. showed alterations in the size, form and aspect, beeing easily ruptured duringmanipulation. The majority did not lay eggs during this period. From the day +14 a. t. there was a marked difference betweenthe average number of ticks in the groups treated with Fluazuron and the control. In the day +58 a. t. there was no differencein the group treated with Fluazuron (1 mg/kg), Cypermethrin and the control but the group with 2 mg/kg showed a lowernumber of ticks. The group treated with 2 mg/kg showed a slighty low number of ticks between the days +7 and +58 a. t. incomparison with 1 mg/kg and in the day +25 there was no tick in this group. In all the groups there were ticks surviving in theear surrounding region.