Add to ORKGResidues of the anticoagulant rodenticide Brodifacoum in meadow voles (Microtus pennsylvanicus) sampled from an orchard popula¬tion after broadcast treatment with the commercial bait VOLID decreased as the orchard rate of application and concentration of Brodifacoum in the bait decreased. Oral LD— determinations for the experimental rodenticide EL-614 were 8.8 mg/kg for meadow voles and 24.0 mg/kg for pine voles (M. pinetorum) . No size preference by meadow and pine voles for bait pellets from 2.38 to 4.76 mm in diameter was observed in lab¬oratory tests