虫龄是一种生物词汇，指的是昆虫幼期生长到一定程度就要脱一次皮。
对幼虫的生物活性，均随虫龄的增加而下降，且集琦虫螨克的活性远比菜喜高。
The larvicidal activity of avermectin was significantly higher than that of spinosad, and both decreased with increase of the larval age.
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；
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，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.
应用推荐