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二代棉铃虫Heliothis armigera(Hiibner)的发生在潍坊具有落卵盛期短,峰日卵量高的特点。常年落卵盛期10—12天,峰日卵量占全代累计卵量的30％左右,最高达52.5％。因此,搞好卵峰日的预测,对于掌握有利时机,科学防治二代棉铃虫有实际的指导意义。笔者用1975年以来的二代棉铃虫卵峰日观测资料与当地4、5月份月平均累积温度分析发现有着密切的关系。今以4、5月份月平均累积温度为自变量(x),二代棉铃虫的卵峰日为因变量(y),作相关与回归分析建立预报方程,可在卵峰日前20余天作出预报,为防治提供依据。 资料的整理统计 历年4、5月份月平均累
Heliothis armigera (Hiibner), a second generation cotton bollworm (Helibothis armigera), was found in Weifang. Perennial larvae peak 10-12 days, the peak amount of eggs accounted for 30% of the cumulative generation of eggs, up to 52.5%. Therefore, to do a good job on the prediction of the egg peak day is of practical significance in grasping the favorable opportunity and scientifically preventing and treating the second generation cotton bollworm. The author used the second generation bollworm egg peak date observation data since 1975 and the local April and May monthly average cumulative temperature analysis found that there is a close relationship. The monthly average cumulative temperature in April and May as the independent variable (x) and the second generation cotton bollworm as the dependent variable (y) were used to establish the prediction equation by correlation and regression analysis, which can be predicted more than 20 days before the peak , To provide the basis for prevention and treatment. The statistics of the data in the calendar month 4, May average monthly tired