Study on the Biological Characteristics of Cabbage Alternaria and the Screening of Medium

[Objective] The aim was to explore biological characteristics of cabbage Alternaria.[Method]Effects of temperature and light on the germination of Alternaria spore were studied;the colony diameter of Alternaria was measured;the best medium for the germination of Alternaria spore was screened.[Result]After eight Alternaria strains were cultured by PSA medium,HuoShaoPing BHB 1 had the best sporulation quantity.The most suitable medium for spore germination of Alternaria was PSA medium,meanwhile PDA medium,bean sprouts medium and corn medium were also better.Alternaria spore could germinate between 0 ℃ and 35 ℃,and the optimum temperature was about 15 ℃.The spore germination of Alternaria under the daylight lamp was higher than under UV irradiation,but it couldn't be too long under daylight lamp.The measurement of the colony diameter of Alternaria showed that the growth of the colony was faster from the first four to seven days.[Conclusion] The research results provide theoretical basis for the resistance breeding of cabbage Alternaria and prevention and control technology.