Co-Ral Plus Insecticide Cattle Ear Tags are for effective control of buffalo fly, including control of synthetic pyrethroid resistant fly populations on beef and dairy cattle. Co-Ral Plus is impregnated with Coumaphos and Diazinon, both anticholinesterase insecticides of the organophosphate chemical class. The insecticides are slowly released from the tag to protect cattle against buffalo fly for up to 4 months. Co-Ral Plus' dual tag system spreads the active and protects both flanks.