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2008年杨扁角叶蜂[Stauronematus compressi-cornis(Fabricius)]在菏泽市突发成灾。据市林业部门调查,全市发生面积达2000hm2,平均虫口密度每百叶51.6头,高者达300余头。有的地方在主要
In 2008, Stauronematus compressi-cornis (Fabricius) was suddenly catastrophic in Heze City. According to a survey conducted by the municipal forestry department, an area of 2000hm2 occurred in the whole city with an average population density of 51.6 heads per hundred leaves and a height of more than 300 heads. Somewhere in the main