近20年来,杨圆蚧(Quadraspidiotus gigas(Thiem et Gerneck)]在我国北方不断扩散蔓延,已知分布在东北三省、宁夏、内蒙、青海、甘肃、山西、陕西、北京等地。绥化地区于1976年进行森林病虫普查时,仅在安达,望奎发现,随后三肇等县均有发现,据该地区病防站1984年统计,已遍及各县,危害面积已达76万亩,其中严重危害达2O％左右,为了深入了解害虫发生和扩散蔓延规律,我们在绥化市新华乡进行调查研究。 In recent 20 years, Quadraspidiotus gigas (Thiem et Gerneck) has been spreading and spreading in the northern part of our country. It is known to be distributed in the three provinces of Northeast China, Ningxia, Inner Mongolia, Qinghai, Gansu, Shanxi, Shaanxi and Beijing. In the year of forest disease and insect census, only in Anda, Wangkui found, followed by Sanzhao and other counties were found, according to the statistics of the area in 1998, has covered all counties, hazardous area has reached 76 acres, of which serious Hazards up to 2O%, in order to understand the pest occurrence and spread of the spread of law, we Xinhua in Suihua City to conduct research.