nd instar larvae 龄幼虫
rd instar larvae 龄幼虫
th instar larvae 龄幼虫
-instar larvae 龄幼虫
3-instar larvae 龄幼虫
st instar larvae 龄幼虫
Natural survival rate of eggs and the various instar larvae in different years were also investigated.
并观察了不同年份棉铃虫卵和各龄幼虫的自然存活率。
In contrast, the temperature did not distinctly influence the survival of both 3rd and 5th instar larvae.
温度对3龄幼虫取食、生长和存活无显著影响，但对5龄幼虫的取食和体重增长则有显著影响。
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。
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