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关帝林局孝文山一带是我省华北落叶松种子的采区之一。但由于受霜冻、病虫等危害,所以采种不正常,丰收的一九七○年采种十五万斤,一九七一年颗粒未收。据一九七二年五月初观察,落叶松座果很好,预计是一个丰收年,但因五月中旬一场晚霜,造成了该年度严重欠收。面对两年颗粒未收的现实,引起了该局领导和广大职工的重视,他们遵照毛主席“要认真总结经验”的教导,进行了充分的讨论,总结出一九七二年颗粒未收的主要原因是晚霜危害,并研究了对策:采用六六六烟雾剂在林中放烟防霜冻的办法,坚决与霜冻作斗争,为加速“绿化祖国”尽自
Guandi Forestry Bureau Xiaowen Mountain area is one of the mining area of North China Larch seed. However, due to frost, pests and other hazards, so the seeds are not normal, bumper crop in 1970 seized 150,000 pounds, 197 grains were not received. As early as early May 1972, it was observed that the fruit of the larch was good and was expected to be a good harvest year. However, due to a night frost in mid-May, it caused a serious default for the year. In the face of the fact that the grain has not been collected for two years, it has drawn the attention of the leadership of the bureau and the vast numbers of workers. They have conducted sufficient discussions in accordance with Chairman Mao’s teachings of “serious lessons learned” and concluded that the particles were not collected in 1972 The main reason is the late frost damage, and the study of countermeasures: the use of six hundred sixty-six aerosol smoke in the forest to prevent frost, resolutely fight frost, in order to accelerate the “greening motherland” from