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1983年,我们在北票县国营大青山林场11年生油松纯林中,进行了灭幼脲三号防治松毛虫试验,试验面积32.5亩。结果证明,灭幼脲三号防治松毛虫幼虫效果显著,杀虫率达90％以上,并且不污染环境,不杀伤天敌,对人畜无毒害,是一种公害较小的仿生农药。亩用药量小,成本低廉,每亩药费只需4角左右。因其为胶悬剂,喷洒后着落于松针上,很快形成一层薄膜,具有抗雨水冲刷的性能。喷后只要不立即降雨,对杀虫效果无明显影响。残效期达30天左右。
In 1983, we conducted the test of control and treatment of Dendrolimus marchum in the 11-year-old Pinus tabulaeformis plantation at the Daqingqingshan Forest Farm in Beipiao County, with a test area of 32.5 mu. The results show that, mefenphos-3 control pine caterpillars larvae significant effect, the insecticidal rate of 90% or more, and does not pollute the environment, do not kill the natural enemies, non-toxic to humans and animals, is a less harmful bionic pesticides. Mu dose of small, low cost, only 4 per acre drug around. Because it is a suspension of plastic, spray landed on the pine needles, the rapid formation of a thin film, with anti-rain washout performance. As long as the spray does not immediately after the rain, insecticidal effect no significant effect. Residual validity of up to 30 days.