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上海郊区棉花苗期病害以红腐病的发病率最高,一般年份发病率为10～40%,重发年不少田块达90%以上。棉苗红腐病是由镰刀菌(Fusarium SP)侵染致病,为害棉苗的根、茎、叶。为对市郊棉苗红腐病的镰刀菌种类、发病规律和防治方法有较完整的了解,我们自1981年起作了系统研究。材料和方法1.品种:沪棉204。2.调查范围:市郊十个县有代表性的棉田,出苗到定苗,每十天调查一次,共调查各类型田309块。3.分离与接种:将病苗的根、根茎和叶部病斑,在PDA 培养皿中分离培养,采用 Booth,C 分类系统鉴定镰刀菌种类。然后回接,孢子液浓
The suburbs of Shanghai cotton seedling disease with the highest incidence of red rot disease, the general incidence of 10 to 40% years, many of the plots of re-issued more than 90%. Cotton seedlings are rotten by the Fusarium (Fusarium SP) infected disease, damage cotton seedling roots, stems and leaves. In order to have a complete understanding of the species, pathogenesis and control methods of the red rot of cotton seedlings in the suburbs, we have systematically studied them since 1981. Materials and methods 1. Variety: Hu Mian 204.2. Scope of the survey: A representative cotton field in ten counties in the suburbs is to emerge to Ding Miao and survey is conducted every ten days. A total of 309 plots of various types are investigated. 3. Separation and inoculation: the seedling roots, rhizomes and leaf lesions were isolated and cultured in PDA petri dishes, Booth, C classification system identified Fusarium species. Then back, spore liquid concentration