1·It was showed that high mortalities in the stages of egg(13 5%), 1st instar larvae(18 2%)and pupae(19 0%) were the main factors influencing the growth of the experimental population.
结果表明，卵期、 1龄幼虫期、蛹期的死亡率较大，分别为13 5 %、 18 2 %和19 0 % ，是影响种群数量增长的主要因子。
2·Various corn borer microsporozoites were used to feed and soak Dendrolimus honi larvae at the instar of 1,2,4 and 7 for infecting them.
用不同浓度的玉米螟微孢子虫悬浮液，饲喂及浸泡感染1、2、4、7龄云南松毛虫幼虫。
3·In experimental populations, mortalities of the 5th instar larvae and pupae were higher than those of instars at initial stages.
实验种群中初期死亡率较低，5龄幼虫和蛹的死亡率较高。
4·A large amount of sericin protein was synthesized after the 5th day of the last instar and its synthetic activity was the highest on the last day of the 5th instar.
中部丝腺中丝胶蛋白的大量合成，是在五龄5日以后，以熟前一日合成活性最高。
5·The results showed that the absorption of nitrogen decreased hile that of sugar increased with larval development from the third to fifth instar.
结果表明：幼虫对饲料中氮的吸收能力随虫龄增加而下降，对糖的吸收能力则随之而增强；