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四川在8月中旬-9月中旬是棉花烂铃发生的高峰时期。连续阴雨,湿度80％以上,5日日照低于15小时,烂铃多损失重。试验表明,棉疫病是引起烂铃的主要原因。15天以下的棉铃未见发生烂铃,铃期40天以上者烂铃最多。85％以上的烂铃发生在5台果枝以下。覆膜棉田下部结铃较多,烂铃也重。烂铃轻重程度与铃重呈负相关,γ=-0.8735与皮棉损失率呈正相关,γ=0.9863,1—5级烂铃的皮棉损失率15。6—98.7％,有效白花量减少42.8—100％,品级降低2—4级,经济价值显著下降。
Sichuan in mid-August to mid-September is the peak of the cotton boll bell. Continuous rainy weather, humidity above 80%, 5 days less than 15 hours of sunshine, bad bell more loss of weight. Tests show that cotton disease is the main cause of bad bell. Less than 15 days of cotton boll no bad bell, bell ring more than 40 days of the most bad bell. More than 85% of rotten bells occur below 5 fruiting branches. Film cotton bolls lower part of the lower, bad bell also heavy. The severity of rotten bell was negatively correlated with the boll weight, γ = -0.8735 was positively correlated with the loss of lint, γ = 0.9863, the lint loss rate of rotten bell was 15.6-98.7% and the effective flowering decreased by 42.8-100 %, Grade 2-4 lower level, the economic value decreased significantly.