近年来，由于耕作、生态、气候和土壤氮素水平的变化等，豆天蛾在平原季风气候旱作农业区发生逐年加重，由次要害虫上升为主要害虫。通过系统调查、普查和研究观察，进一步了解了豆天蛾在诸条件演变后的发生规律和生物学特性，并运用数理统计的方法，研究了其发生程度受气候因子６～７月降水、６～８月相对湿度、８月５日至９月１５日降水的制约，判明了６～７月份降水量是主导因子，并用主导因子与卵虫量建立回归预测式为：ｙ＝０．２８８＋０．００９２ｘ。１０ａ历史资料拟合，符合率９６．１％。 In recent years, due to tillage, ecology, climate and soil nitrogen levels change, bean moths in the plain monsoon climate dry farming areas have increased year by year, from secondary to pest rise. Through systematic investigation, census and research observation, we got a better understanding of the law of occurrence and biological characteristics after the evolution of Begonia moth, and studied the degree of occurrence by climate factors from June to July, 6 ~ August relative humidity, precipitation from August 5 to September 15, it was found that precipitation was the dominant factor from June to July, and the regression formula was established as follows: y = 0.288 + 0. 0092x. 10a historical data fitting, with a rate of 96.1%.