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近几年来,经过大量的模拟与标记试验,基本证明一代红铃虫为害所造成的虫害花脱落率在长江下游棉区要比健花脱落率高30—35％,在长江中、上游棉区要比健花脱落率高40％左右。但是,在当前长江流域棉花产量构成水平下,经考察对棉花的结铃和产量未造成明显的影响。由于这一试验结果有可能涉及到今后对红铃虫的综合防治,为了早日使其在大面积生产上推广使用,本文将从以下几个方面进行分析比较。 一、第一代红铃虫为害与棉花的总脱落率 由于花芽是棉花形成蕾、花、铃的基础,因此用棉花分化的有效花芽数量来计算棉花的总脱落率要比用蕾、花、铃等资料计算的棉花总脱
In recent years, after a large number of simulation and labeling tests, the pest flower shedding rate basically caused by the damage of the first generation pink bollworm was found to be 30-35% higher in the cotton area of the lower reaches of the Yangtze River than that of the flowering flowers. In the middle and upper reaches of the Yangtze River, Than the flowering rate of about 40% off. However, at the present level of the cotton production in the Yangtze River basin, no significant impact on cotton boll bolling and yield has been observed. As the results of this experiment may involve the future comprehensive control of pink bollworm, in order to make it widely used in large-scale production as soon as possible, this article will be compared and analyzed from the following aspects. First, the first generation of red bollworm damage and the total loss of cotton flower bud is the formation of buds, flowers, bolls, so the use of cotton buds to determine the effective number of flower buds off the total rate of use than buds, flowers, Bell and other data calculated total cotton off