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三代棉铃虫Helithis armigera Hübner发生期正值棉花蕾铃生长盛期,若防治不适,则引起蕾铃脱落,直接影响棉花产量。而三代棉铃虫卵峰日年度间差异较大,经验预报准确率往往不高。做好三代棉铃虫卵峰日的预测,对于掌握有利时机,科学防治三代棉铃虫有实际的指导意义。本文根据我场历年的资料,应用条件频率法,对我场三代棉铃虫卵峰日进行了预测研究,现介绍如下。
Three generations of cotton bollworm Helithis armigera Hübner period coincided with the peak of cotton bud growth, if the prevention and treatment of discomfort, then lead to fall off, a direct impact on cotton production. The third generation of cotton bollworm eggs peak year difference between the larger, the empirical prediction accuracy is often not high. Proper three-generation cotton bollworm egg peak day, to grasp the favorable opportunity to scientific prevention and control of three generations of cotton bollworm has practical significance. This article based on my field calendar year data, the application of frequency method, the field three generations of cotton bollworm egg peak day forecast study are as follows.