在林业生产中,森林资源由于病虫害所造成的损失是十分惊人的。据统计,我国为害森林的病虫害有2,000多种,每年发生面积6,000—7,000万亩,相当干全国每年造林面积的总和。南方十三省(区)的马尾松毛虫为害面积常年存2,500—3,000万亩,按每亩损失木材0.1836立方米计算,每年因松三虫为害损失木材达500万立方米,约相当于全国木材采伐量的13％。因此,积极防治森林病虫害是森林保 In forestry production, the loss of forest resources due to pests and diseases is very alarming. According to statistics, there are over 2,000 kinds of pests and diseases in our country that damage forests, with an annual area of ​​60,000-7,000 mu, equivalent to the sum of the annual afforestation area in the whole country. The damage area of ​​Dendrolimus punctatus in the thirteen provinces (districts) of the south is 2,500-3,000 mu perennial. According to the loss of 0.1836 cubic meters of lumber per mu, the loss of 5 million cubic meters of wood per year due to the damage of pine and tribulus is about the same as that of the national wood 13% of the harvest. Therefore, active prevention and control of forest pests and diseases is forest protection