The Relationship between Occurrence of the Dieback Blight of Phyllostachys pubescens and Stand Growth and Site Conditions

From 1991 to 1998,an intensive investigation on the disease index and ecological factors of the dieback blight of Phyllostachys pubescens was performed in forestry farms in Fujian Province.The data analysis of 83 plots of P.pubescens plantations indicated that the disease index conrrelates to ecological factors.The ecologicalmodel of the dieback blight of P.pubescens was established as follows: Y=40.4932-3.5435C11-1.9805 C21-0.9427C22-6.7996C31-5.0023C32-3.6588C41-2.409 1C42-17.9836C51-12.2900C52-8.8894C61-3.1504C62.In this formula Y represents forest disease index and C11～C63 represents ecological factors(level).According to the investigation and analysis,the occurrence and development of the dieback blight of P.pubescens is an integrated result of a long time reciprocity of different ecological factors.On the basis of themodel,assistant forecasting technique and ecological control by afforestation were put forward.