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IDENTIFICATION OF VERTICILLIUM WILT PATHOGEN OF COTTON IN CHINA

Zhang Xuzhen Zhang Shuqin(Institute of Plant Protection, Soil and Fertilizer of Hebei Province) Li Qingji Chen Bi(Beijing Agricultural University) Chen Jidi(Institute of Microbiology, Academia Sinica) Yao Yaowen(Institute of Plant Protection, Chinese Academy of Agricultural Sciences)  
A collection of 280 single spore strains from 9 isolates of verticil- lium wilt of cotton in eight provinces (Liaoning, Hepei,Henan,Shanxi Sichuan, Yunnan,Xinjiang, Jiangsu) of China has been studied.All of them are identified to belong to the species Verticillium dahliae Kleb. How- ever there are certain differences existing in these single spore strains regarding to the size,shape and amount of microsclerotia produced,and the growth rate of the colonies at 30℃.Some strains differ also in patho- genicity to cotton.All such deviations are considered as merely physio- logical differentiations.
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