论文部分内容阅读
杉树是我县的主要用材树种。自1971年全国林业工作会议以来,我县杉木用材林基地建设发展很快,现已营造10多万亩。但近几年来杉梢小卷蛾危害逐年加重,据1975年6月在狮子公社龙岗大队林场4年生杉木幼林内调查,被害株率100%,主梢被害率62%,已成为杉木的主要害虫。我们曾经采用多种方法防治,如人工捕杀、抹芽培养主干、喷洒六六六与敌百虫粉剂、喷射40%乐果乳剂、施放六六六烟
Cedar is my county’s main timber species. Since the National Forestry Conference in 1971, the construction of Chinese fir timber forest base in our county has been developing rapidly, and over 10 million mu have now been built. However, in recent years, the damage caused by the snakehead moths has been increasing year by year. According to the investigation in the 4-year-old Chinese fir plantation of Longgang Dachang Forest Farm in Ligong Commune in June 1975, the damage rate was 100% and the damage rate of the main shoots was 62% . We have used a variety of methods to prevent and control such as artificial hunting, wiping bud training trunk, spraying BHC and trichlorfon powder, spraying 40% dimethoate emulsion,