鼹鼠跗线螨(Tarsonemus talpae Schaarschmidt)近年来在四川水稻区域严重发生,在田间常伴随水稻褐鞘症蔓延,螨量高峰出现在水稻孕穗期以后。通过抽取田间褐鞘稻株作列联表分析,证实该螨的活动确与褐鞘症的发生有联带关系。将螨体进行分离和扫描电镜观察,发现其体表及附肢可携带和传播稻叶鞘腐败病菌(Sarocladium oryzae)。在隔离控制条件下用螨和这种病菌对水稻作接螨、接菌、接螨接菌和不接四种处理,结果显示接螨接菌与单接菌二处理症状表现最早最普遍,但症状的发展和严重程度以前者更甚。因此本文提出,四川的水稻褐鞘症系由叶鞘腐败病菌为主要诱因,鼹鼠跗线螨在其中起着传播病菌而加剧症状表现的作用。 In recent years, Tarsonemus talpae Schaarschmidt has been severely affected in the rice region of Sichuan Province. It often accompanied with the spread of brown rice sheathworm in the field, and the peak of mite appeared after the booting stage of rice. By extracting brown rice sheath in the field for contingency table analysis, confirmed the activity of the mite indeed associated with the occurrence of brown sheath disease. The mite body was isolated and observed by scanning electron microscopy and found that its body surface and appendages could carry and spread Sarocladium oryzae. Under the conditions of isolation and control, mites and this bacterium were used to catch mites, inoculation, pick moth and then not take the four treatments. The results showed that the earliest and the most common symptom of mites and single inoculation were the earliest and the most common Symptoms and the severity of the former even worse. Therefore, this paper suggests that brown rice sheath blight disease in Sichuan is the main cause of leaf sheath rotting bacteria. Mole sting mite plays a role in spreading germs and exacerbating symptoms.