玉米螟是一种多化性兼性滞育的昆虫,弄清该虫各世代的滞育率,对了解下代及次年的种群发生量和在其预测预报上具有重要意义。据报导,玉米 Ostrinia furnacalis(Guenee)在北京地区一年发生2—3代;一般认为以末一代的老熟幼虫进入滞育。对于第一代是否有局部幼虫进入滞育,以及第 Corn borer is a polyclinic and diapause insects. To understand the diapause rate of each generation of this worm, it is important to understand the population of next generation and next year and its prediction. It has been reported that maize Ostrinia furnacalis (Guenee) occurs 2-3 generations a year in the Beijing area; it is generally considered that mature larvae of the last generation entered diapause. For the first generation whether there are local larvae entering diapause, as well as the first