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Open Access Publications from the University of California

Montane vole control with Rozol® paraffinized pellets in orchards of the Pacific Northwest


Rozol® Paraffinized Pellets (0.005% chlorophacinone) were effective in reducing populations of montane voles greater than the EPA standard of 70%. This test substance was applied using a Vicon spreader at the approximate rate of 10 lbs/acre to the vegetation of the orchard floor. An intensive mark-recapture census was used as a direct census to determine population change as a result of the test substance application. An apple slice index was used as an indirect method to confirm population change. Few carcasses were found during the carcass search practiced in this study. Determination of active ingredient residues was done on the vole carcasses found during the carcass search events.

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