利用低浓度药剂,破坏越冬幼虫的正常生理,从而达到毒杀害虫的目的,在苏联已获得成功的经验。为了寻求药剂防治越冬松毛虫新的途径,我们在江西省东乡县红星垦殖场和弋阳县湖山公社进行了试验。前者系较平坦的丘陵地区,气温较高,松毛虫发育较快,11月上旬大多已进入4龄;后者是起伏较大的丘陵地区,气温较低,松毛虫发育慢,11月中旬为3—4龄。试验从10月29日开始,先后进行了5次.目前尚在进行中,现将初步结果整理如下:1.11日上旬,当东乡县第三代幼虫才进入4龄的时候,由于连日阴 The use of low concentrations of drugs, destruction of the normal physiology of overwintering larvae, so as to achieve the purpose of killing insects in the Soviet Union has been successful experience. In order to find a new way to prevent and control winter winged mites, we conducted experiments in Red Star Kennedy Farm in Dongxiang County of Jiangxi Province and Hushan Commune in Yiyang County. The former is relatively flat hilly areas, the temperature is higher, the rapid development of pine caterpillars, most of the early November has entered the age of 4; the latter is a hilly area with relatively large fluctuations, the temperature is low, the slow development of pine caterpillars, mid-November 3-4 years old. The trial began on October 29, has carried out 5. Has been under way, the preliminary results are now organized as follows: 1.11 days early, when the third generation larvae of Dongxiang County before entering the age of 4, because even the day overcast