森林可能受到多种方式的危害,如乱砍滥伐、火灾、冰雹、风灾、霜冻、干旱、环境污染等,但最严重的危害可能是森林病虫害,每年我国遭受森林病虫危害的林地面积超过上亿亩.森林病虫综合防治应以预防为主,以营林技术为基础,防止环境污染,把病虫控制在不成灾的水平,以达到保护环境和促进林木生产的目的。 Forests may be harmed in many ways, such as deforestation, fire, hail, wind disaster, frost, drought, environmental pollution, etc. However, the most serious damage may be forest pests and diseases. Each year, the forest area affected by forest pests and diseases in our country exceeds Hundreds of millions of mu The comprehensive prevention and control of forest pests and diseases should be based on prevention, based on silviculture techniques to prevent environmental pollution and control pests and diseases at unimproved levels so as to achieve the purpose of protecting the environment and promoting forest production.