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三化螟在南宁地区一年发生5代(包括越冬代)。笔者根据南宁地区历年诱蛾灯资料和气象资料结合三化螟的特性,找出影响本地区三化螟各世代发生期迟、早的主要因素(5厘米深的土壤温度和雨日)用数理统计的方法进行探索,建立了各世代发生期的预报方程。并经过1979年实际预报应用,收到了较好的效果。同时对广西荔浦、贵县、钦州三县的三化螟各世代发生期资料以同样的因素建立了各世代螟蛾发生期预报方程。现将初步研究结果报道如下:
Stem Borer occurred in Nanning area five generations a year (including overwintering generation). According to the characteristics of the rice stem borer (Chilo suppressalis) in light of the information of lure moth lamp and meteorological data in the past years in Nanning, the author found out the main factors (5 cm deep soil temperature and rain day) Statistical methods to explore and establish the prediction of the occurrence of each generation equation. And after 1979 the actual forecast application, received good results. At the same time, the forecasting equations for the occurrence of Pyralidae in each generation were established on the basis of the same factors for each generation of three generations of Pythium mesovares in three counties of Lipu, Guixian and Qinzhou in Guangxi province. Now the preliminary findings are reported as follows: