Date of this Version
Broadcast treatments of Volak (Brodifacoum) applied at rates of approx. 20 lbs/acre gave 98% control of voles when active ingredient levels were from 0.005% to 0.0005% in the bait. Of the two Rozol (Chlorophacinone)formulations tested, the French (Lipha) pelleted formulation appeared to be slightly better than what is currently being marketed in the USA. The Maki (Bromodialone) bait formulated in the same wax bait carrier as the Rozol-USA gave no better control than Rozol. Ramik-Brown (Diphacinone) did not appear to be as good as the other anticoagulants tested when applied either as a broad¬cast or as a hand placed bait.
Plastic place pack Volak gave excellent control of voles when placed under shingles, old tires split in half, or cinder blocks. A new pelleted Zinc Phosphide formulation from Bell Labs gave excellent control of pine voles when applied as a hand placed or broadcast bait. Zinc Phosphide oat and corn, surface-coated, grain formulations did not perform well. In a separate experiment a laquard wheat formulation of Chlorophacinone performed well as a hand placed bait at 10 lbs/A under shingles.