Pival, an anti-coagulant rodenticide

1. Pival at 0·025% is somewhat less toxic than warfarin at 0·005% to R. norvegicus when ingested for periods up to 72 hr. It is also less acceptable in a dry cereal bait. 2. Pival and warfarin at 0·025 % are about equally toxic and equally acceptable to R. rattus. 3. Young R. rattus appear to be more resistant than heavier rats to both Pival and warfarin. 4. The fungicidal properties of Pival are discussed.