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美国每年森林病虫害的发生面积约为200万公顷-400万公顷,防治的面积仅为40万公顷-80万公顷。自上世纪九十年代以来,美国将森林病、虫、空气污染等纳入森林健康系统进行管理,特别是对于外来有害物种入侵无条件地进行防治。对森林病虫害的监测和防治,主要采取引诱剂监测和生物防治方法,不破坏森林的生物多样性。每年实施防治使用的生物制剂主要有:病毒、Bt、白僵菌、天敌及昆虫生长调节剂等等。
The annual area of forest pests and diseases in the United States is about 2 million hectares -4 million hectares and the area under control is only 400,000 hectares - 800,000 hectares. Since the 1990s, the United States has included forest diseases, insects and air pollution into the forest health system to manage it. In particular, the United States has unconditionally carried out prevention and control measures against invasions of exotic harmful species. Monitoring and control of forest pests and diseases mainly use the methods of attractant monitoring and biological control without destroying the biological diversity of forests. The annual implementation of biological control agents are: viruses, Bt, Beauveria, natural enemies and insect growth regulators and so on.