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烂铃是上海郊区棉花生产上的重要问题之一。发病较轻的年份烂铃率为10～15％,发病较重的年份为20～30％。多数高产棉田和东部沿海棉区,由于棉花长势较好,加之沿海棉区8、9月份受台风影响较大,几乎年年烂铃较重。棉花烂铃,一般都发生在棉株中下部早期优质的伏前桃和伏桃上。据我们1975年9月12～23日对12块典型田块调查,平均烂铃率为14.7％,其中下部第l～3果枝的烂铃占总烂铃数的71.8％,第
Sprouting is one of the most important issues in cotton production in the suburbs of Shanghai. Lesser incidence of years rotten boll rate of 10 to 15%, the incidence of heavier years 20 to 30%. Most high-yielding cotton fields and the eastern coastal cotton area have been affected by the typhoon in August and September in the coastal cotton area due to the better cotton growth and heavier year-round rotten bells. Cotton boll boll, usually occur in the lower part of cotton plants in the early high-quality pre-V Peach and Walnut. According to our survey on 12 typical plots from September 12 to September, 1975, the average rate of rotten bolls was 14.7%, of which the rotten bolls of the first to third fruit branches in the lower part accounted for 71.8% of the total number of rotten rots.