美国白蛾(Hyphantria cunea Drury)是世界性检疫害虫,主要危害果树、行道树和观赏树木,尤以阔叶树为重。我国于1979年在辽宁首次发现。由于该虫食性杂、传播快、为害猖獗,给林术、果树及农业生产造成了很大威胁。1984年9月,对自然感病死亡的美国白蛾幼虫,经分离镜检确定其病原为核型多角体病毒(NPV)。一、病症感病死虫一般多出现于冬青树顶梢,病虫常以尾足或腹足悬挂于嫩梢上,有的呈倒“V”形悬挂。死亡虫体呈暗褐色,体内组 Hyphantria cunea Drury is a worldwide quarantine pest that harms fruit trees, street trees and ornamental trees, especially hardwood trees. Our country was first discovered in Liaoning in 1979. Because of the worm food sex, spread fast, rampant damage to forestation, fruit trees and agricultural production caused a great threat. September 1984, the natural death of the American white moth larvae, microscopic examination confirmed the pathogen of nuclear polyhedrosis virus (NPV). First, the disease Sick insects generally appear in the holly tops, pests often tail or foot hanging on the tender tip, and some were inverted “V” -shaped suspension. Death worms dark brown, body group