Patent ID: 8425925

Claim:
A method for controlling arthropod ectoparasite infestation of a domestic animal comprising applying an ear tag to the animal, the tag comprising: a pesticidally effective amount of an active ingredient composition that consists of a) an avermectin or combination of avermectins as the only active ingredient of the eartag; and b) a 1,3-benzodioxole synergist compound or a combination of 1,3-benzodioxole synergist compounds; c) the weight ratio of the synergist component (b) to the macrolide component (a) being greater than 1; impregnated in a polymer resin base from which it can be released, wherein the ectoparasite controlled is at least one of horn flies, Haematobia irritans irritans , and buffalo flies, Haematobia irritans exigua.