早酥梨叶枯病危害损失与防治指标研究

Study on losses caused by Leaf blight of pear and control index

梨叶枯病是在早酥梨上发现的一种新病害 ,病原菌为 Mycovellosiella pyricola。通过调查早酥梨叶枯病在田间的消长动态 ,实测不同病情指数下 1年生早酥梨苗的高、粗生长量、7～ 8年生结果树平均单果重、单株产量 ,建立了苗期生长量和结果树产量损失估计模型 ,推算出该病害防治指标病指苗期为 12 .74%,结果树为 13.84%

Leaf blight of pear is a new disease that have been discovered on pear,the germ is mycovellosiella pyricola On the basis of investigation of disease progression,the heights and stem diameters of one year old trees representing growth stock,and mean single fruit weights and single tree fruits yield of seven to eight year old fruit bearing trees under different disease index.From data collected from these experiment,loss asessment model were established in growth stock for young index trees and fruit yield for fruit bearing trees.Control calculated using these models were 12.74% and 13.84% in disease index for young trees and fruit bearing trees respectively.