四川柑桔根腐病病原真菌种类研究

THE FUNGAL SPECIES CAUSING ROOT ROT OF CITRUS IN SICHUAN,CHINA

本文报道四川柑桔根腐病的病原真菌12种,其中腐皮镰孢(Fusarium solani)、寄生疫霉(Phytophthora parasitica)、柑桔褐腐疫霉(P. citrophthora)、德氏腐霉(Pythium debaryanum)和腐霉-1(Pythium sp.-1)等5种为主要种群,其余7种为次要种群。

During 1990-1991,more than 240 root rot samples of citrus were collected from 15 counties in Sichuan,China and 518 isolations were obtained from these samples. Some isolations selected from them were tested for their pathogenicity to the 3 mo. old seedlings of Poncirus trifoliata (L. )Raf. , Citrus reticulata Blanco.and C. sinensis Osbeck. The results of the identification of the pathogenic isolations indicated that there are Pythium de-baryanum , P. hemmianum. P. hydnosporum, Pythium sp. -1 , Pythium sp. -2 , Phytophthora parasitica ,P. citrophthora ,P. palmivora ,Fusarium solani . F. oxysporumn, Rhizoctonia solani and Sclerotium bataticola attacking citrus roots in Sichuan ,China. The main species were Fusarium Solani, Pythium debaryanum, Pythium sp. Phytophthora parasitica , and P. citrophthora. They are widely distributed and frequantly isolated.