论文部分内容阅读
我县是全省油松次生林的主要集中分布区,近年来,松毛虫危害十分猖獗,现有51.44万亩松林不同成度地发生松毛虫,占全县108万亩松林的47.6%,据调查全县由于松毛虫危害,每年将损失木材94,000立方米,每年直接经济损失达940万元,严重地影响了林业生产。同时,松毛虫不断蔓延,大面积的松林面临被毁灭的危险,如何有效地除治松毛虫,已成为林业生产中一个重要问题。 多年来我们采用常规化农药进行大面积的防治,取得了一定效果。但往往用药量大,成本高,难以使大面积受害松林得到有
In recent years, the damage caused by pine caterpillars is very rampant. There are 51.44 million mu of pine forests in different degrees of occurrence, accounting for 47.6% of the 1,080,000 mu of pine forests in the whole province. According to the survey Due to the damage caused by pine caterpillars, the county will lose 94,000 cubic meters of timber per year and the direct economic loss will amount to 9.4 million yuan per year, seriously affecting forestry production. At the same time, the pine caterpillars continue to spread, and the pine forests in large areas are at risk of being destroyed. How to effectively deal with the pine caterpillars has become an important issue in forestry production. Over the years we use conventional pesticides for large-scale control, and achieved some results. However, the dosage is often large, the cost is high, it is difficult to get a large area of pine forests get