关键词: 仓库, 食堂, 灭鼠, 鼠密度, 回升率

Abstract: Objective To test the rebounding speed of rat density after deratization in large storehouses and canteens and to set the intervals for control. Methods The corn poison bait of 0.005%bromadiolone was put for 4 d,the 100 division powder board was used to determine the rat density and calculate the rate of deratization and the rebounding rate of rat density. Results The rat density(the average number of division covered per board) was 7.44and 8.87respectively in storehouses and canteens before deratization,it dropped to 0.14and 0.28respectively 21 dafter deratization,with the rate of deratization at 98.12%and 96.84% respectively. The rebounding rate of rat density was 1.88%,3.49%,4.57%,8.74%,13.17%,23.25%,79.44%and 100.81%respectively in storehouses for 1-8months after deratization respectively. And the rebounding rate of rat density was 3.61%,6.99%,16.01%,23.68%,62.01%and 100.90%respectively in canteens 1-6months after deratization. Conclusion The rat density can be maintained at a low level in storehouses within 6 months and in canteens 4 months after deratization. The rebounding speed of rat density is related to food sources,water sources,rat prevention installations and environments. And it is suggested that deratization should be conducted once every 5-6months in storehouses and 3-4months in canteens.