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晋南地区棉苗黑斑病在1963年至1964年大流行,由于来势猛,发展快,死苗集中,造成了严重的缺苗现象,直接影响单位面积产量和品质。为此,我所进行了一系列研究,初步探明了棉苗期病菌和棉苗营养的动态,明确了棉田地面撒施石灰是简便、有效、安全的防治措施。 一、初侵染来源:在调查中,清楚地看到病情轻重与茬口有关,新茬轻,老茬重。黑斑病菌
In southern Shanxi cotton seedling black-spot disease in 1963 to 1964 pandemic, due to the fierce trend, rapid development, concentrated dead shoots, resulting in a serious shortage of seedlings, a direct impact on yield per unit area and quality. To this end, I conducted a series of studies that initially identified the dynamics of cotton seedling germs and cotton seedlings nutrition, defined the ground cotton sprinkling lime is a simple, effective and safe control measures. First, the source of early infection: In the survey, clearly see the severity of illness and stubble, the new stubble light, old stubble. Black spot bacteria