十字花科蔬菜黑斑病原种群组成及季节变化

关中地区十字花科蔬菜黑斑病的病原菌属半知菌类交链孢霉,主要有4种,一年四季均可发生.其混合种群在十字花科蔬菜上的发生比率为:A.brassicae(Berk)sacc 48.14%;A. brassicicola(SchW)Wilts=A.oleracea milbraith 34.82%;A. temis ness 16.7%;A.raphani 0.35%.种群比率在白菜上的动态变化为:9月上中旬,A. brassicicola为100%,9月下旬,A.tenuis为44%,A.brassicae为16.7%,A. brassicicola为36.1%,11月上中旬A.brassicae上升为94.6%;越冬贮藏期,A.brassicae为77.5%,A.terais为10.6%,A.brassicola为5.6%,其它为6.3%.早春以A.brassicae为主,占100%,五月中旬以后,A.brassicae下降为65%,A.braasicicola上升为30%.6月份后,以A.brassicicola为主.

THE COMPONENT AND THE PERENNIAL CHANGE OF POPULATION OF BLACKCK SPOT PATHOGEN IN CRUCIFERAE VEGETABLE CROPS

In Shaanxi province, the black spot of cruciferae vegetable cropa is caused by a population, which is made up of four varieties of hioniliales of Fungi imperfecti.The rate of every variety happened in ten cruciferae vegetable crops is Alternaria brassicae (Berk) Sacc 98.19%,Alternaria brassi-cicola (Schw) Wilts=A.oleracea mlbraith 39.8%.Alternaria tennis ness 16.6%,and Altarnaria raphani 0.35%,and the rate in Chinese cabbage is A.brassicicola 100% before tenth of sept;A.tennis 44%A.brassicae 16.7%,A.brlssicicola 36.1%,after sept.twentieth,A.brassi:ae up to 94.6%,in 1-20 days of nov.and A.brassicae 77.5%,A.tenuis 10.6%,A.brassicicola 5.6% and others 6.3% in storage stage.