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1 幼苗次生感染的原因一是粒间传染:同一发芽皿内种粒与种粒之间病原菌的传播,带病原菌的种粒或幼苗的病菌在温、湿度适宜条件下迅速繁殖蔓延传播。二是沙子传染:发芽用的沙子未经过消毒清洗处理或消毒不彻底,使沙子带菌。三是发芽皿传染:发芽皿都是重复使用的,如果上一次发芽时有带病原菌的种子腐烂,病原菌会残留于发芽皿内,如果发芽皿未彻底清毒、清洁,则
1 seedling secondary infection is one of the causes of intergranular infection: the same sprouting dish between the seeds and seeds of the spread of pathogens, pathogenic bacteria or seedlings of bacteria in the temperature and humidity conditions of rapid propagation of reproductive spread. The second is the sand infection: germination of the sand without disinfection and cleaning or disinfection is not complete, so that sand carrying bacteria. Third, sprouting dish infection: sprouting dishes are reused, if the last germination of the seeds with the pathogen decay, the pathogen will remain in the sprouting dish, if the sprouting dish is not completely detoxification, cleaning, then