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苗期病害严重影响全苗密植、壮苗早发,按为害部位分,主要有根病和叶病两类。根病是常发性复合病害,主要为红腐、立枯和炭疽。立枯病对棉苗为害株率虽低,但强度高,常造成缺苗断垄;红腐病对棉苗影响强度虽小,但分布广,为害株率高,常造成弱苗晚发,推迟生育进程。据晋南棉区历年不完全统计,棉苗根病发病率和病情
Seedling disease seriously affect the whole plant close planting, strong seedlings early hair, according to the damage part points, there are two main types of root and leaf disease. Radicular disease is a common complex disease, mainly red rot, stand dead and anthrax. Blight on the cotton seedling blight rate is low, but the high intensity, often resulting in lack of seedlings broken ridge; red rot on the cotton seedlings intensity is small, but widely distributed, the strain rate is high, often resulting in late emergence of weak, Postponed the process of childbearing. According to Jinnan cotton calendar year incomplete statistics, the incidence of cotton seedling root disease and disease