一、分布及危害 杨网蝽(Stephanitis sp)在河南、江苏、山东等省均有分布,为害严重。我区主要分布在许昌、鄢陵、临颖、舞阳、郾城、襄县、鲁山、宝丰等地。在许昌地区林科所和襄县林科所调查,有虫株率为100％,株平均虫口密度达万头。初步调查统计,全区杨树被害株率30％左右。主要危害I—72、I—69、I—214、沙兰杨、鲁伊沙等新引进杨树品种,也危害毛白杨、健杨、P—15A、柳 First, the distribution and damage Stephanitis sp (Stephanitis sp) in Henan, Jiangsu, Shandong and other provinces are distributed, devastating. My area is mainly distributed in Xuchang, Yanling, Lin Ying, Wuyang, Tancheng, Xiang County, Lushan, Baofeng and other places. In Xuchang area Linke and Xiang County Forestry Branch survey, the rate of 100% strains of insects, strains average population density of 10,000. Preliminary investigation and statistics, the region poplar strain rate of about 30%. The main harm to I-72, I-69, I-214, Sallam, Ruisha and other newly introduced poplar varieties, but also against poplar, Jian Yang, P-15A, willow