Kinds Of Fungus Disease Caused Mature Pepper Blight In Protecteded Field And Pathogen Identification

The cultivation of vegetable crops in china developed rapidly in recent ten years, especially on cultivation of vegetable crops in protected field The cultivation of pepper was widespread . The area of pepper cultivation was rather large. The phenomenon of pepper blight in protecteded field was widespread.Through investigation and study of the fungus disease caused blight of pepper in Nangjin Yangzhou Nangton Yanchen Huaian etc. in Jiansu province. Four pathogenes of fungus disease, Phytophthora. Verticilliion dahliae. Fusarium. Sclerotiniose, were discovered.. In different area the advantage vegetable disease was differentPhytophthora is the main pathogen that cased pepper blight in protecteded field of Huaian. Study on the pathogen show that P.capsici infects pepper stem and P.parasitica infects pepper fruit were found. The biological characters and the spore morphology of two kinds of Phytophthora were different. The ratio (of length/width) of P.capsici is higher than one of P.parasitica P.capsici spore form generally is ellipae. The P.parasitica spore form generally is egg-shape. The papillas of their spores were obviously. The most suitable temperature-range for P.capsici growth was 26-28 ,while for P. parasitica was 24~26 .The colony form of P.capsici in PDA is radioactively. The colony form of P.parasitica in PDA is like flower petal. That was first report.Sclerotiniose was serious in pepper protecteded field in Dongtai. Through identification on the pathogen. The result of identification showed that the pathogen was similar as one of rapes. Their pathogens were all Sclerotinia sclerotiorum(Lib) de Bary.Investigation showed that Fusarium capsicum wilt was widespread but not serious. Studying the spore form and biological characters of pathogen on different medium, showed pathogen of this disease was Fusarium solaniIn Haian Taizhou etc.cities, V.dahliae wilt was found besides above mention disease.It was the first report in Jiansu province.There also were the phenomenon that there were infection by Fusarium or Verticillium in the infected pepper plants by Phytophthora.