1947—1948年,德国出现大规模的小毒虫害,几千公顷最好的云杉林遭受八齿小蠹虫(Ips typographus)的毁坏,直至后来研制成化学防治剂Hexachlorcycloheta(HCH)后,才真正控制了这场毁灭性灾害。从此以后,每年防治和控制小蠹虫成了林业工者的“必修课”。尽管如此,每逢干旱年份或风倒灾害,小毒虫总又是大规模繁殖。采取有目的防治措施是必不可少的。在这种情况下,研制成功小 From 1947 to 1948, large-scale small-scale pest damage occurred in Germany. Thousand-hectare best spruce forests were destroyed by the Ips typographus until they were developed into the chemical control agent Hexachlorcycloheta (HCH) Control this devastating disaster. Since then, annual prevention and control of beepers has become a “compulsory course” for forestry workers. In spite of this, small insects are always massively multiplied every drought or storm. It is indispensable to take targeted prevention and control measures. In this case, the successful development of small