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五龄时翅芽延伸至腹部第三节。The wing buds extend to 3 rd abdomen on 5 th instar.

通过供给不同龄期的寄主幼虫的方法研究蜂对寄主的选择性。The host selectivity was tested by suppling host larvae with different instar.

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梨小食心虫幼虫不同虫龄对光照的敏感性具有显著的差异。Different instar of oriental fruit moth has significant differences in the different photoperiod.

目的通过姬氏染色法以便观察家蝇三龄幼虫的各种血细胞形态。Objective To observe the hemocytes of musca domestica larva of the 3th instar by Giemsa's staining.

并观察了不同年份棉铃虫卵和各龄幼虫的自然存活率。Natural survival rate of eggs and the various instar larvae in different years were also investigated.

芦苇格姬小蜂为美洲斑潜蝇的幼虫寄生蜂，比较喜欢在美洲斑潜蝇的三龄幼虫上寄生。The parasitoid of the leaf miner, Pnigalio phragmitis Erdos, prefers the third instar to parasitizing.

采用微生物法测定5龄健康家蚕食下克蚕菌后的经时过程血药浓度。Kecanjun concentrations in the 5th instar healthy silkworms plasma was detected by the microbiologic assay.

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幼虫共有5龄，以夜晚蜕皮为主，5龄幼虫老熟后即觅地化蛹，化蛹持续时间2-4天。The larvae had five instars, and exuviated at night, pupated at 5rd instar old larvae, pupation time need 2-4 days.

本文还比较了长翅型雌、雄性个体之间间接飞行肌的发育情况。The wing dimorphism differentiation sensitive instar was inferred and compared between the male and female individuals.

被寄生的3龄幼虫与未被寄生的发育历期差异达极显著水平。Significant difference was found in development duration of the 3rd instar of parasitized larvae and unparasitized larvae.

平卧川牛漆甾酮对幼虫具有弱的毒杀活性和良好的拒食活性，且与浓度相关。Low toxicity and good antifeeding activity to the 3rd instar larvae were exhibited, which are dependent upon concentration.

实验种群中初期死亡率较低，5龄幼虫和蛹的死亡率较高。In experimental populations, mortalities of the 5th instar larvae and pupae were higher than those of instars at initial stages.

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试验对各龄期幼虫的体长、头宽进行测量，得出以头宽作为主要指标来鉴别虫龄比较准确。By testing larva body-length and head-width, the result showed that the major index of distinguish instar was according as head-width.

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.

而集琦虫螨克则对4龄幼虫的化蛹率、蛹羽化率及羽化后成虫的产卵量均有显著的降低作用。However, avermectin fed by 4th instar larvae could remarkably reduce the percentage of pupation and adult emergence, and egg production.

一只二龄幼虫可日食杨扇舟蛾卵十五粒，一只成虫可日食松毛虫十五条，食量大过体重数倍。A second instar nymph can eat 15 reddish-tipped prominent moth eggs a day and an adult 15 pine caterpillars, several times its own weight.

但取食的开始时间在龄期之间具明显差异，以4龄个体最早取食。However, the initiation time of post winter feeding was obviously different among these instars, larvae in 4th instar beginning feeding earliest.

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模拟分析表明，菊小长管蚜发育速率随温度的升高而加快，2、3龄若虫较1、4龄若虫对极端温度的忍耐性强，发育最适温度高。The 2nd and 3rd instar nymphs were found more tolerable to extreme temperature and had higher optimal temperature than 1st and 4th instar nymphs.

目的研究新型吡啶类鬼臼毒素衍生物对3龄淡色库蚊幼虫的的毒杀活性。Objective The bioactivity of twelve novel pyridine ring derivatives of podophyllotoxin were tested against 3rd instar larvae of Culex pipiens pallens.

在各气候条件下，影响胭脂虫种群数量变动的主导因素为卵的孵化率及1龄若虫或2龄若虫期的强降雨。In every climate zone, the key factors that affected the number of the cochineal population were eggs unhatched and strong rain during the 1st and 2nd instar.