如在第一龄期的幼虫称一龄（虫），在第二龄期的幼虫称二龄（虫），其余类推。
不同虫态及虫龄的血清和血细胞中酚氧化酶活力有很大的不同，血清和血细胞中酚氧化酶活力变化规律一致。
The enzyme activity in plasma or haemocytes was different at different stages and instars, but the change trend of the enzyme activity in plasma and haemocytes was consistent.
结果表明，不同虫态及虫龄的多酚氧化酶活力有很大的不同，其中以5龄幼虫酶活力最高，蛹酶活力最低。
The enzyme activity of the 5th instar was the highest and that of the pupa was the lowest.
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。
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.
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