大型仓库及食堂灭鼠后鼠密度回升速度的调查

目的调查大型仓库及食堂两类环境灭鼠后鼠密度的回升速度,以便确定灭鼠的间隔时间.方法采用饱和投毒法,0.005%溴敌隆玉米毒饵连投4 d,用100格粉板法测定鼠密度,计算灭鼠率和鼠密度回升率.结果仓库及食堂灭鼠前鼠密度（每板平均踏格数）分别为7.44和8.87格,投药21 d后鼠密度分别降至0.14和0.28格,灭鼠率分别为98.12%和96.84%;灭鼠后1～8个月仓库的鼠密度回升率分别为1.88%、3.49%、4.57%、8.74%、13.17%、23.25%、79.44%和100.81%;灭鼠后1～6个月食堂的鼠密度回升率分别为3.61%、6.99%、16.01%、23.68%、62.01%和100.90%.结论灭鼠后仓库在6个月内,食堂在4个月内能保持较低的鼠密度,鼠密度的回升速度与食源、水源、防鼠设施及外环境有关,建议仓库每隔5～6个月灭鼠1次,食堂每隔3～4个月灭鼠1次.

Study on the Rebounding of Rat Density After Deratization in Large Storehouses and Canteens

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.