近年五代棉铃虫在我市发生较重，危害损失较大，且影响发生的因素较多，特别是四代的滞育率较难准确计算，不能直接用四代的发生实况进行预报，预报难度较大。为能对五代棉铃虫准确预报，我们根据目前积累的历史资料建立了二次多项式预测预报模型，能提前半个月作出预报。在今 In recent years, the five generations of cotton bollworm occurred heavier in our city, harming the loss, and the impact of the occurrence of many factors, especially the four generations of diapause rate is more difficult to accurately calculate, can not directly use the four generations of live forecast, prediction difficulty Larger. In order to accurately predict the five generations of cotton bollworm, we established a quadratic polynomial forecasting model based on the historical data accumulated so far, and we can make a forecast of half a month in advance. Today