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松毛虫多发生于我省的深山区。由于山高、坡陡、水源缺乏,再加现有药械喷程较低,因而应用喷粉或喷雾的方法防治,受到一定的限制。为了探讨适于山区特点的防治方法,1960年我们在平市在林场进行了用地面撒药粉的方法防治越冬幼虫的试验,曾获得90％以上的杀虫效果;1964年又在青山口大队做了大面积示范防治,并在唐山地区进行推广;1971年又在青龙县结合推广工作,对松毛虫幼虫越冬规律及撒药方法作进一步的观
Dendrolimus occurred in the deep mountainous areas in our province. Due to the high mountains, steep slopes, lack of water sources, coupled with the lower spraying speed of the existing medical devices, the application of dusting or spraying methods is subject to certain restrictions. In order to explore suitable for the prevention and treatment of mountain characteristics, in 1960 we Pingxiang in the forest farm with a powder spilled method of prevention and treatment of overwintering larvae experiment, has received more than 90% of the insecticidal effect; again in 1964 at the Qingshankou brigade did Large-scale demonstration of prevention and control and promotion in Tangshan area; in 1971 and again in Qinglong County to promote the work of the pine caterpillar larva overcast winter and the method of dispensing further view