The Investigation Of Disease Types And Research Of The New Occurring Diseases Of Greenhouse Vegetables In North China

96 vegetable diseases were recorded through investigation of the vegetables cultivated in greenhouse of North China, and the pathogen was determined. In this study, Nine new diseases were founded, including three new record species of fungi, one new record species of fungi of China, five new record species of host of China and five new occuring symptoms of the traditional diseases.1. The new pathogen were determined by analysis of its symptoms, morphology, culture characters, pathogenicity test and the sequence of ribosoma1 DNA-ITS.Nine kinds of new diseases were studied, including one New Record Species of Fungi of China: [Cercospora tetragoniae (Speg.) Siemaszko]; three New record species of host: Phaseolus vulgaris, Solanum melongena (Myrothecium roridum Tode ex Fr.), Foeniculum valgare (Rhizoctonia solani Kühn; five new record species host of China: Lycopersicon esculentum Miller (Myrothecium roridum Tode ex Fr.), Cucurbita moschata (Duch.) Poiret [Colletotrichum capsici (Syd.)Butl.], Lycopersicon esculentum Miller (Pseudocercospora fuligena Roldan), Momordica charantia [Corynespora cassiicola (Berk.&Curt. ) Wei], Capsicum frutescens L.var.grussum Bailey [Rhizopus stolonifer (Ehrenb.ex Fr.) Lind].2. Five new occuring symptoms were founded and related pathgen were described.Gummy Stem Blight on Cucurbits(The rot on growing point and fruits ), Target Leaf Spot on Cucumber (large-scale Lesion), Corynespora Leaf Blight on eggplant (lesion on stem), Downy Mildew on Cucumber (water-inked spots), Grey mold on Pepper (Ghost spots).3. Though investigating of the vegetables cultivated in greenhouse, 96 diseases were determined and the related infected region, pathgen and damage degree were also recorded, expecially some pathgen that are easy to be confused.The study mainly depended on the traditional method conjugated with molecular biology method to identify the new-pathogens, which were demonstrated to be effective and has important value on identify the pathogen and the prevention of the diseases.