Abstract
Acaricidal efficacy of cyperrnethrin, ivermectin, trichlorphon and Azadirachta indica (Neem) was evaluated in commercial
layers (N = 500 of 40 to 50 weeks of age, naturally infested with Arg!s persicus. The number ofticks was counted on all the
birds before treatment and on day 1, 7, 14,21 and 28 post-treatment. The best control achieved was 86.85% by cypermethrin
treated birds against Argas persicus infestation followed by ivermectin (82.96%), 40% Azadirachta indica (51.89%) and
trichlorphon (27.54%). Cypermethrin, invermectin, Azadirachta indica (40%) and trichlorphon were 35.42, 50.28, 75.24,
86.85 and 86.85; 1.64,9.34,41.20, 82.96 and 82.96; 42.16, 57.83, 67.02, 75.67 and 51.89 and 28.74,37.12,42.51,34.13 and
27.54% effective on day 1,7,14,21 and 28 post-treatment respectively.
Key words: acaricidal efficacy, Argaspersicus, layers
