永泰县世行项目造林地幼林病虫害调查

Surveys of Young Forest Diseases and Insect Pests on Afforestation Sites of the World Bank Project in Yongtai County

调查表明：在永泰县世行项目造林地上幼林病虫害发生面积达２０３ｈｍ２；害虫有蕉艺夜蛾、微红梢斑螟等９种，病害有松枯梢病、赤枯病等５种，以微红梢斑螟和松枯梢病为害较严重；集中成片、速生快长的单纯针叶林是造林地幼林病虫害发生严重的主要因素。

The surveys demonstrate that the occurrence area of young forest diseases and insect pests on af-forestation sites of the World Bank project in Yongtai County reaches 203hm2;there are 9 kinds of insectpests of Hyssia ad ustu,Diary ctria vubelle,etc.and 5 kinds of diseases of Diplod ia pinea ,Pestalop sis funevea ,etc.;the harm of D.vubelle and D.pinea is relatively serious;and the vast-stretch and fast-growing pureconiferous forest is the main factor of that the diseases and insect pests seriously occur in the young forests onafforestation sites.