Efficacy and persistence of cypermethrin 4.5% + DDVP 50% (Ectofarma®) in the control of Boophilus microplus and larvae of Dermatobia hominis on naturally infested crossbred dairy cattle

Abstract

The effectiveness and persistence of Ectofarma* in the control of B. microplus and D. hominis larvae were evaluated. Initially, the effect on estimated reproduction and percentage of reduction was determined by dipping female ticks in 1:400 diluted solution of the product. The percentage of reduction was 95.34, and the reduction on hatchability of larvae was 100%. Then, in a field trial the product, in the same dilution, was handsprayed over a group of nine bovines. The number of ticks on treated and untreated animals were counted on days 0 ,1 ,2 ,3 ,7 ,1 4 ,2 1 , 28, 35 and 42 after treatment. D. hominis larvae were counted on day 3 and further, weekly, until the sixth week. The efficacy in vitro of Ectofarma" on the hatchability of B. microplus eggs was 100%. In the field trial this product was highly effective against ticks during 3 weeks, and ticks mean number on the treated group was lower than on control one, until the
fourth week after treatment. Reduction of D.hominis larvae reached 65% on the third day post-treatment, and mean number of larvae in treated animals was always lower than the amount found in untreated ones.