试用桑树开叶数预测桑瘿蚊幼虫发生期的方法(初报)

A PRELIMINARY STUDY OF PREDICTION OF INCIDENCE OF EPIMYIS SP.LARVAE BASED ON THE NUMBER OF EXPANDED MULBERRY LEAVES

在积温预测法的基础上,经研究发现桑瘿蚊(Ep imyia sp)从成虫盛发日到幼虫盛发日经过的历期,在同一地理种群中的“桐乡青”桑树将生长出2.04开叶,以此作为预测桑瘿蚊幼虫发生高峰期,以便提出对其幼虫防治时期。我场通过多年应用此法预测桑瘿蚊幼虫高峰期其预测,结果与实际发生情况基本吻合。

According to the “accumulative temperature -based method”, it was estimated that 2.04 leaves of the mulberry trees （Tongxiangqing variety） would develop on the average in the time space between the full occurrence of adults of Epimyia sp. and the full occurrence of its larvae. Based on this data, the peak of larva occurrence of the pest was predicted and the timing for the control of the larvae was decided. The results of prediction appeared in good agreement with the actual condition at the Beibei Silkworm Egg Station.