Abstract: Mmdarin vole is one species of primary destructive rodents in agriculture area in the west of Henan. The population density and the harmful degree of Mmdarin vole at Chengcun Country in Lingbao city of Henan province were studied from August 1993 to March 1995,and got the economic threshold of its prevention. Four harmful degrees were stipulated and got the threshold for wheat x=133.9 for soybean x=181.1，At this density of Mandarin vole, prevention must be started in order to get a good economic result.

Key words: Mmdarin vole (Microtus mandarinus), Population density, Damage degree, Economic threshold

摘要： 棕色田鼠是河南西部农作区的主要危害鼠种。1993年8月～1995年3月在河南省灵宝市程村乡对棕色田鼠的密度及其对农作物的危害程度进行了调查研究 , 并对小麦、黄豆2种不同作物地防治棕色田鼠的经济阈值进行了初步估算。把棕色田鼠对这2种作物的危害分为4个等级, 小麦地防治棕色田鼠的经济阈值为133.9只/hm²; 黄豆地防治棕色田鼠的经济 阈值为181.1 只/hm²,达到此密度应进行防治,否则将造成不同程度的经济损失。

关键词: 棕色田鼠, 种群密度, 危害程度, 经济阈值