Resistance of Wild Norway Rats in North Carolina to Warfarin Rodenticide

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Science  23 Jun 1972:
Vol. 176, Issue 4041, pp. 1343-1344
DOI: 10.1126/science.176.4041.1343


Reports concerning the ineffectiveness of warfarin rodenticide, used at farms and stores in a rural area about 8 kilometers in diameter near Raleigh, North Carolina, prompted subsequent laboratory testing. All of the 25 Norway rats trapped from the area survived 6 days of no-choice feeding of bait containing 0.025 percent (by weight) warfarin.

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