The results as follow:The damage duration in the area was from September to November of 2004,and the accumulative damage rate was 34.25%,especially during September of 2004,which was up to 17.42%.

• 结果表明；本地区鼠类的危害期主要为9月至11月；累计危害率为34.；25%25；其中9月份的危害最严重；危害率高达17