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我场几年来的调查表明,正常年份棉花烂铃率为8～15%,产量降低2%左右,个别多雨年份烂铃率高达20%以上,产量降低5%以上。品质亦有不同程度的下降。因此,防治棉花烂铃也是夺取棉花优质高产的重要环节。一、棉花烂铃发生的原因(一)排水不畅。花铃期常因暴雨和秋天连阴雨,导致棉田积涝。尤其是南方棉区更为突出,如果排水不及时,田间湿度过大有利于病原菌的滋生和侵入,烂铃率明显提
According to the surveys conducted in recent years, the rate of rotten boll bolls in normal cotton ranges from 8% to 15% and the yield decreases by 2%. The rate of boll bolls in individual rainy years is as high as over 20% and the yield is reduced by more than 5%. Quality also have varying degrees of decline. Therefore, the prevention and treatment of cotton bolls is also an important part of winning high-quality cotton. First, the reasons for cotton boll (a) poor drainage. Flowers often due to heavy rains and even the rainy autumn, leading to floods cotton fields. Especially the southern cotton area is more prominent, if the drainage is not timely, the field is too humid conducive to the breeding of pathogens and intrusion,