纽氏钝绥螨 Amblyseius newsami(Evans)是近年广东湛江地区捕食橡胶树主要害螨六点始叶螨 Eotertranychus sexmaculatus Riley的重要天敌。据调查,六点始叶螨的天敌中钝绥螨占80～95％,是抑制胶园六点始叶螨的重要因子之一。我们在1978～1979年间,对其生物学特性,田间种群数量变化进行了观察研究,现将结果报导如下。 Amblyseius newsami (Evans) is an important natural enemy of Eotertranychus sexmaculatus Riley, the major pest mite in predatory rubber trees in Zhanjiang, Guangdong Province in recent years. According to the survey, six-point spider mite natural enemies of Amblyseius accounts for 80 to 95%, is one of the important factors to inhibit the rubber plantation Tetranychus urticae. From 1978 to 1979, we observed the changes of its biological characteristics and the population changes in the field. The results are reported as follows.