Species and ecological control of disease on cultivated Gentiana rigescens in Yunnan

Objective :To find out variety of the fungal diseases of cultivated Gentiana rigescens and provide important basis for prevention.Methods:The diseases were diagnosed based on field investigate,symptoms observation,pathogen isolation,determination the size of morphological and verification following the Koch's Postulate procedures.Results:Anthracnose(Colletotrichum gloeosporioides),grey mould(Botrytis cinerea),brown spot(Alternaria tenuis),rust(Aecidiumpers),circular spot(Pestalotiopsis),leaf blight(Stemphylium,Ascochyta,Pleospora)and nematodes(Heterodera spp.,Meloidogyne spp.)were found on Gentiana rigescens.Anthracnose was the first main disease,the diseased plant rate was over 40% and disease severity was 4～5 degree and second disease was rust,incidence of rate was less 10% and other diseases rate was not enough 2%.Conclusion :All these diseases on Gentiana rigescens are reported for the first time and Gentiana rigescens is the new host plant of the diseases.