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为了明确棉花库源比(铃叶比)变化对红叶茎枯病发生的影响,揭示红叶茎枯病的病因,山西省农科院棉花研究所开展了多项试验并获得初步结果。试验结果显示,棉株的病害严重度与其铃叶比呈高度正相关。早熟品种开花期早,铃叶比高,病害发生重;盛蕾期以前的气温对棉花生长和红叶茎枯病发生的作用大于土壤水分的作用。与常温处理相比,提高棉花3叶期至盛蕾期的气温,可促进棉花的营养生长,减小库源比,其发病盛期延后约45天,病情
In order to clarify the cotton source ratio (bell-leaf ratio) changes on the occurrence of red leaf blight, reveal the cause of red leaf blight, Shanxi Academy of Agricultural Sciences Institute of cotton carried out a number of experiments and obtained preliminary results. The test results showed that the disease severity of cotton plants was highly positively correlated with its bell-leaf ratio. Premature varieties flowering early, high ratio of bell leaves, disease occurred heavy; Shenglei pre-temperature on cotton growth and stem blight occurred more than the role of soil moisture. Compared with the normal temperature treatment, to improve the cotton leaf temperature from 3 leaf stage to Sheng Lei period, can promote the vegetative growth of cotton, reducing the source ratio, the peak period of its onset of about 45 days delay, the disease