Field Test of the Efficiency of the Rodenticide Compound W.A.R.F. 42

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Abstract
The rat (Rattus norvegicus) populations and colony boundaries were detd. for 13 residential blocks in Baltimore. The anticoagulant, Compound W.A.R.F. 42, mixed with ground corn at 1 mg./g., was exposed in 6 of the blocks and remained 14-18 days. Consumption was measured at 1- to 2-day intervals. Populations were again detd. after the poisoning period and reductions of 69-100% were recorded, with the weighted avg. reduction of 84.5% per block, while the unpoisoned blocks showed no unexplainable changes. Dead rats were recovered in large numbers generally after the 4th and 5th day of poisoning. However, bait consumption showed a rapid decline after the 2d or 3d day, and a relatively low consumption level thereafter.
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