绿化带大树主要病虫害调查分析

通过对丹东市主要绿化树种病虫害的调查分析,结果表明:危害行道树和绿化带的病虫害很多,病害主要是流脂病、腐烂病、干腐病和黑斑病,其中流脂病和腐烂病发生的面积大,发病率较高;高温、高湿和栽植过密是导致病虫危害的主要因素;混交度较差,纯林比例大,给病虫害传播创造了条件;生长势较弱的区段病虫危害相对较重。

Analysis on Maj or Diseases and Pests for the Trees of Green Belt

Through the investigation of the main pests damaged landscaping species in Dandong City,result shows that the pests damaged street trees and green belt are more.The pest diseases is mainly Tympanis pithya ,Valsa mali,Macrophoma sp.&Mbrunnea.Among of which the occurrence area of Tympanis pithya &Valsa mali is large and the occurrence is higher;high temperature and high humidity & dense planting are the main factors to cause pest disease;the mixed density of mixed forest is poor and the proportion of pure forest is larger,which create the conditions for the spread of pests and diseases,the pests in the region with poor growth is more serious.