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1983年,上海郊区棉花红叶茎枯病发生面积较大,其中以南汇、川沙、嘉定、金山等县为重,影响了棉花的产量和品质。据初步调查其主要原因: (一)根系发育不良:棉株进入发根壮株关键时期,梅雨提早来临,6月9日～7月18日,降雨量达353.8毫米,造成土壤板结,肥料流失,根系生长发育不良,为后期红叶茎枯病的发生酿下了“祸根”。由于棉株一级侧根成长期间,遇到了梅雨,土壤环境变劣,排水不良的田块和不够健壮的棉株,其一级侧根的生长和次级侧根的发生受到抑制,加上花铃期又遇到了长时间的高温干旱,叶片蒸腾作用加强,矛盾突出,因而发病严重。9月中旬检查侧根生长情况(见表)。
In 1983, the blight of cotton leaf blight occurred on the suburbs of Shanghai with a large area. Among them, Nanhui, Chuansha, Jiading, Jinshan and other counties took the heavy impact, affecting the yield and quality of cotton. According to a preliminary investigation of its main causes: (A) root system dysplasia: Cotton plants into the hair roots during a critical period, the rainy season early, June 9 ~ July 18, rainfall 353.8 mm, resulting in soil compaction, loss of fertilizer , Poor growth and root growth, resulting in the late red stem blight brewing “curse.” During the growth of the first lateral root of cotton plant, the growth of the first lateral root and the occurrence of the second lateral root were inhibited due to the rainy season, the deteriorating soil environment, the poor drainage field and the less robust cotton plant, Encountered a long time of high temperature and drought, the role of leaf transpiration to strengthen contradictions, and thus a serious disease. Late September, check the growth of lateral roots (see table).