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自1959年11月在江西东乡县红星垦殖场进行25％DDT乳剂稀浓度防治越冬松毛虫试验得出有效浓度2100～6000倍后,12月份除继续试验外,又增加6％可湿性666和25％DDT混合剂的试验。现小结于下: 12月份数次寒流侵入江西,松毛虫都团聚于松梢顶端针叶丛中,在有太阳的中午也很少取食活动。已进入休眠。 (1)12月上旬当第三次寒流侵入,日平均温度由14.8℃下降为8.7℃时,喷撒2,000倍25％DDT死亡率为99.1％,4,000倍死亡率为81.2％。寒流过后,气温上升为10.7℃施药后三天气温续升到14.6℃,用1,000倍25％DDT死亡率为96.6％。用6％可湿
Since November 1959 in Hongxing, Dongxiang County, Jiangxi red star farm 25% DDT emulsion concentration control effect of winter mite test obtained effective concentrations 2100 ~ 6000 times, in addition to continuing the test in December, an increase of 6% wettability 666 and 25 % DDT mixture test. Now summarized in the following: In December several cold intrusion in Jiangxi, pine caterpillars are reunited in the top of the pine needles, in the sun at noon feeding activity rarely. Has entered hibernation. (1) In the first ten days of December, when the third cold current invaded, the average daily temperature dropped from 14.8 ℃ to 8.7 ℃, the mortality rate of DDT was 99.1% and the death rate of 4,000 times was 81.2%. After the cold current, the temperature rose to 10.7 ℃. Three days after application, the temperature continued to rise to 14.6 ℃. The death rate was 96.6% with 1,000 times 25% DDT. Wet with 6%