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近几年来,经过大量的模拟与标记试验,证明一代红铃虫危害棉花所造成的虫害花脱落率在长江下游棉区比健花脱落市高30—35%,在长江中、上游棉区比健花脱落率高40%左右。但是,在当前的产量构成水平下,未发现对棉株的结铃和三桃比例有影响。为了更好地说明这一问题,使其尽早在生产上推广和运用,本文将从以下几方面进行一些分析和比
In recent years, after a large number of simulation and labeling tests to prove that a generation of red bollworm damage caused by cotton pests flower exfoliation rate in the lower reaches of the Yangtze River cotton than the flowers off 30-35%, in the Yangtze River, the upstream cotton area ratio Quzhou flowers off about 40% high. However, at the current level of yield composition, no impact on boll number and peach ratio of cotton plants was found. In order to better illustrate this issue, to make it as soon as possible in the promotion and use of production, this article will conduct some analysis and comparison of the following aspects