[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.