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2010年8月,美国白蛾在我省连云港市连云区首次发现,当年连云港市的5个县(区)均发生疫情。目前,我省连云港、徐州、宿迁、盐城、淮安等苏北5市都有美国白蛾危害,其中连云港、徐州两市的所有县(市、区)均为危害区。2012年初,国家林业局公布最新的美国白蛾疫区,江苏省沛县、新沂、邳州、连云、海州、新浦、赣榆、东海、灌南、滨海、响水等区县列入其中。在江苏,美国白蛾一年发生3代,4月下旬越冬蛹开始羽化,5月中旬达羽化高峰期,5月下旬出现第一代幼虫,危害可以持续到7月上旬。3龄前幼虫群集在寄主叶片上吐丝拉网取食,4龄幼虫开始分散,并吐丝将受害叶片、小枝条连城网幕,网幕随着龄期增大而扩展;5龄幼虫陆续离开网幕分散取食,食量大增。
In August 2010, the American white moth was found for the first time in Lianyun District, Lianyungang City of our province. All the 5 counties (districts) in Lianyungang City were affected by the outbreak. At present, all five counties (cities, districts) in Lianyungang, Xuzhou, Suqian, Yancheng, Huaian and other northern Jiangsu cities have the harm of American white moth, and all counties (cities and districts) in Lianyungang and Xuzhou are hazardous areas. In early 2012, the State Forestry Administration announced the inclusion of the latest white moth epidemic area in Peixian, Xinyi, Danzhou, Lianyun, Haizhou, Xinpu, Ganyu, East China Sea, Guannan, Binhai and Xiangshui in Jiangsu Province among them. In Jiangsu Province, the white moth occurs three generations a year. In late April, overwintering pupae begin to emerge. In May, the peak emerges, and the first generation larvae appear in late May. The damage can last until early July. The larvae of 3rd instar clustered on the host leaf and fed on the net. The 4th instar larvae began to disperse, and the damaged silkworms and twigs were connected to the net screen. The screen expanded as the age increased. Leave the screen scattered eating, food intake increased greatly.