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首页> 外文期刊>Australian Journal of Entomology >Biology and development of Chaetophthalmus dorsalis (Malloch) (Diptera: Tachinidae) parasitising Helicoverpa armigera (Hübner) and H. punctigera Wallengren (Lepidoptera: Noctuidae) larvae in the laboratory
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Biology and development of Chaetophthalmus dorsalis (Malloch) (Diptera: Tachinidae) parasitising Helicoverpa armigera (Hübner) and H. punctigera Wallengren (Lepidoptera: Noctuidae) larvae in the laboratory

机译：实验室中的背绒膜拟南芥（Malloch）（双翅目：Tachinidae）的生物学和发育寄生于棉铃虫（Hübner）和庞氏嗜血杆菌（H. punctigera Wallengren）（鳞翅目：夜蛾科）幼虫。

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Chaetophthalmus dorsalis is a common larval parasitoid of several economically important species of Noctuidae in Australia but little is known about its biology. This paper describes aspects of the behaviour and development of C. dorsalis parasitising Helicoverpa armigera and H. punctigera larvae in the laboratory. At 25°C, C. dorsalis laid a mean of 577 ovolarviparous eggs, 8–9 days after emergence. Parasitoids were able to complete development when newly emerged planidia were placed on all host instars except first instars. Planidia manually placed on the dorsum of the first thoracic segment of host larvae showed no preference to penetrate segments immediately behind the head capsule where they could not be removed by the host. Planidia were significantly faster at penetrating the cuticle of early- (second to fourth) instar compared with late- (fifth and sixth) instar larvae, and late-instar H. punctigera larvae compared with equivalent instars of H. armigera. Parasitoid larval development was significantly faster when planidia were placed on late-instar H. punctigera larvae than on early-instar larvae but puparium development and puparium weight were not affected by host age. Parasitised Helicoverpa larvae gained weight at the same rate as unparasitised larvae until 2–3 days before the exit of C. dorsalis larvae when they entered a premature prepupal phase. Developmental thresholds and day-degree requirements for C. dorsalis were calculated and compared with H. armigera. A new host record for C. dorsalis reared from Neocleptria punctifera (Noctuidae) larvae is given.
机译：Chaetophthalmus dorsalis是澳大利亚夜蛾科中几种重要经济物种的常见幼虫，但对其生物学知之甚少。本文介绍了在实验室中对棉铃虫Helicoverpa armigera和点虫H. punctigera幼虫寄生的C. dorsalis的行为和发育的各个方面。在出壳后的8–9天，C。dorsalis在25°C下平均产下577卵卵胎卵。当新出现的轮虫被放置在除第一龄幼虫之外的所有宿主幼龄虫上时，寄生虫能够完成发育。手动放置在寄主幼虫的第一个胸部节段的背部的Planidia表现出不希望穿透紧接在头囊后面的节段，而这些段不能被寄主移除。与早熟（第五和第六）龄幼虫相比，Planidia在穿透早熟（第二至第四）幼虫的角质层方面要快得多，而与棉铃虫同龄幼虫相比，晚熟的P.tigtigera H. punctigera幼虫。当将晚熟的点状H. punctigera幼虫放上扁平虫时，拟寄生虫的幼虫发育明显快于早起的幼虫，但是的发育和的重量不受宿主年龄的影响。寄生的Helicoverpa幼虫以与未寄生虫的幼虫相同的速度增长体重，直到C. dorsalis幼虫退出早熟期之前的2-3天。计算了背果蝇的发育阈值和日间度要求，并将其与棉铃虫进行了比较。提供了新的宿主记录，从点子虫（Neocleptria punctifera（Noctuidae）幼虫）饲养的背心。

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