湿地松粉蚧是于 1988年传入我国广东省的一种重要林业外来入侵害虫。现在该害虫在我国的分布面积为 35 5 2万公顷 ,严重影响着我国南方松林的生长健康。该害虫在其原产地美国南方并不造成大的危害 ,也不是一种主要害虫。只有当大量应用杀虫剂防治其它害虫时 ,由于杀死了其天敌 ,湿地松粉蚧种群才会明显增长。为控制这一外来入侵害虫 ,中美两国于 1995年开展了从美国引进天敌防治广东省湿地松粉蚧的林业合作项目。本文报道了 1996～ 1997年间在美国南方三个种子园使用杀虫剂防治球果种实害虫时 ,杀虫剂对湿地松粉蚧种群及其两种主要天敌有明显的影响 ,这也间接地说明了寄生性天敌对湿地松粉蚧在自然条件下的控制作用。相关分析显示湿地松粉蚧种群数量与其天敌是密切相关的 ,但杀虫剂可以打破这种平衡。这一方面说明从美国引进天敌防治湿地松粉蚧是可行的 ,另一方面也显示在美国采集湿地松粉蚧天敌应在使用过杀虫剂后的林分中 Pinus elliotis is an important invasive pest of forestry imported into Guangdong Province in China in 1988. Now the area of ​​pests in our country is 35,520 hectares, seriously affecting the growth health of the pine forests in southern China. The pest does not cause major harm in the southern United States of origin and is not a major pest. Only when large numbers of insecticides are used to control other pests, the population of mealybugs become significantly increased by killing their predators. In order to control this pest of alien invasion, China and the United States launched a forestry cooperation project in 1995 to introduce natural enemies from the United States to control Ixodes matshurica in Guangdong Province. This paper reports the significant influence of insecticides on the population and the two main natural enemies of Mycorrhizal patchouli in the use of insecticides to control coniferous fruit pests in three seed orchards in the southern United States from 1996 to 1997. This also indirectly Described the parasitic natural enemies on the slash slash Scale control in natural conditions. Correlation analysis showed that the population of P. tabulaeformis was closely related to its natural enemies, but pesticides could break this balance. On the one hand, the introduction of natural enemies from the United States to control Ixodes matsutake is feasible, on the other hand also shows that in the United States collected wetland mealybugs natural enemies of insecticide should be in the forest after