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acute toxicants adult animals anticoagulant anticoagulant bait averaged bait acceptance bait consumption bait stations baiting points barrios Bureau of Plant burrows Calauan Central Luzon chronic toxicants CM CM coconut College of Agriculture concentration conducted control methods Cotabato coumatetralyl cut by rats damage surveys Denver Wildlife Research dikes dry season estimates evaluation farmers feeding females field grid growing rice habitats harvest hectare irrigated Laguna Laguna Province live-traps night Nueva Ecija numbers of rats observed paddy dikes Pangasinan percent period Philippines Plant Industry polished rice provinces rainfed rat activity rat control rat damage rat populations Rattus argentiventer Rattus rattus mindanensis reduced Results and Discussion ricefield rats Rodent Research Center rodenticides sample Siniloan snap-traps species Sumangil sustained baiting Table Tarlac tillers cut tracking tiles trap success treated plots trials untreated USAID warfarin weeks after transplanting wet season Wildlife Research Center zinc phosphide