Seasonal changes in prevalence of viral disease and parasitism by parasitic insects in a larval population of the smaller tea tortrix, Adoxophyes sp. (Lepidoptera: Tortricidae) in a tea field
Seasonal changes in prevalence of viral disease and parasitism by parasitic insects in a larval population of the smaller tea tortrix, Adoxophyes sp. (Lepidoptera: Tortricidae) in a tea field
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DOI：
10.1303/aez.32.609
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发表时间：
1997-11-01
影响因子：
1.3
通讯作者：
Kunimi, Y
中科院分区：
文献类型：
--
作者：
Nakai, M;Takeda, M;Kunimi, Y
拟寄生蜂和昆虫病原在烟粉虱幼虫种群中的发病率在茨城县筑波的一片茶田里，人们下定了决心。在采集的幼虫中鉴定出3种鞭毛虫、1种肺吸虫和1种鞭毛虫。从死亡幼虫中分离到3种昆虫病原病毒，即昆虫痘病毒(EPV)、核型多角体病毒和颗粒病病毒。总体而言，87.0%的小卷蛾。幼虫被寄生蜂和昆虫病原杀死。网囊姬蜂和EPV是最常见的寄生蜂和病原菌，分别占烟粉虱死亡的37.7%和23.1%。分别为幼虫和幼虫。网纹夜蛾的寄生率在第1代最高，到第4代后逐渐下降。第1代EPV患病率较低，代际间呈上升趋势。在333只死于病毒感染的寄主幼虫中，12.0%的寄主幼虫含有死亡的寄生蜂幼虫。有些寄生蜂幼虫能够从感染病毒的寄主中羽化出来，但这些寄生蜂在化蛹前或化蛹后死亡。在病毒感染的宿主中发育的寄生蜂的死亡时间似乎与病毒的种类密切相关。
The incidence of parasitoids and entomopathogens in a larval population of Adoxophyes sp. in a tea field in Tsukuba, Ibaraki Prefecture, was determined. Three species of Braconids, one species of Ichneumonid, and one species of Tachinid were identified in the collected larvae. Three entomopathogenic viruses, an entomopoxvirus (EPV), a nuclear polyhedrosis virus and a granulosis virus, were isolated from the dead larvae. Overall, 87.0% of Adoxophyes sp. larvae were killed by parasitoids and entomopathogens. Ascogaster reticulatus and EPV were the most common parasitoid and pathogen and were responsible for 37.7% and 23.1% of the deaths in the Adoxophyes sp. larvae, respectively. Percent parasitism by A. reticulatus was highest in the first generation and then decreased progressively toward the fourth generation. EPV prevalence was low in the first generation and increased through the generations. Of 333 host larvae dying from viral infection, 12.0% of host larvae contained dead parasitoid larvae. Some parasitoid larvae were able to emerge from virus-infected hosts, whereas these parasitoids died before or after pupation. The time to death of a parasitoid developing in virus-infected hosts appears to be closely related to the species of viruses.