Long term retention of insecticide members on ID tags is problematic. Additionally, very limited surface area is provided on the insecticide reservoir of certain prior art arrangements, thus compromising the time period over which proper efficacy of the insecticide can be maintained. The present invention aims to solve such problems by providing an insecticide carrying strip that is uniquely configured to be conveniently and reliably attachable to an ear of an animal, as well as to the most commonly used types of commercial ID tags. In addition, the insecticide strip according to the present invention is designed to be pendularly suspended from the post of the male portion of an ear tag member, including the most widely used types of ID tags, so that the strip is freely pivotable about the ear tag. This feature of the present invention provides multiple advantages. Firstly, the resulting pendulous movement of the strip when secured to the ear of an animal promotes the transfer of insecticide from the strip to the animal. Secondly, the freely pendular movement reduces the likelihood of the strip, which by its nature is made from relatively soft plastic material, being ripped or torn from the animal.