Brodifacoum Research Articles

Bait Shyness of Pine Voles to Zinc Phosphide and Anticoagulants Stored with Pesticides

Abstract Storage of brodifacoum (Volid) and chlorophacinone (Rozol) anticoagulant rodenticides with organic phosphate spray materials in a sealed container for more than 57 days slightly reduced Pine vole (Microtus pinetorum) mortality and bait acceptance of Volid, but did not affect Rozol efficacy. Storage of both materials with zinc phosphide bait did not affect acceptance or mortality of pine voles. Pine voles surviving a 3-day exposure to zinc phosphide surface-coated corn and oat bait (ZnP-grain) (2%, w/w) were much less susceptible to a subsequent 5-day exposure to ZnP-grain or ZP Rodent Bait-AG, 14 days after the first exposure. ZP Rodent Bait-AG caused greater mortality than ZnP-grain in both pre-exposed or voles not previously exposed to ZnP-grain bait. Chemical names used: 2-(P-chlorophenyl)phenyl-acetyl[-l,3]-indandione [Rozol; 0.005% chlorophacinone (CPN)]; and 3-[3-(4′bromo[1, 1′-biphenyl]-4-yl)-1,2,3,4-tetrahydro-l-napthalenyl]-4-hydroxy-2H-1-benzopyran-2-one [Volid; 0.001% brodifacoum (BFC)].