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The Effect of Temperatures on the Biological Characteristics of Two Aphid Parasitoids Aphelinus asychis (Walker) and Aphelinus varipes (Förster) (Hymenoptera: Aphelinidae) on Two Aphid Hosts

진딧물 기생봉 목화면충좀벌과 진디면충좀벌의 기주와 온도에 따른 생물학적 특성 비교

  • Kang, Eun Jin (Crop Protection Division, National Academy of Agricultural Science, Rural Development Administration (RDA)) ;
  • Byeon, Young-Woong (Knowledge and Information Officer Division, RDA) ;
  • Kim, Jeong-Hwan (Crop Protection Division, National Academy of Agricultural Science, Rural Development Administration (RDA)) ;
  • Choi, Man-Young (Reclaimed Land Agriculture Research Division, National Institute of Crop Science, RDA) ;
  • Choi, Yong-Seok (Bioenvironment Research Division, Chungnam Agricultural Research & Extension Services)
  • 강은진 (국립농업과학원 작물보호과) ;
  • 변영웅 (농촌진흥청 지식정보화담당관실) ;
  • 김정환 (국립농업과학원 작물보호과) ;
  • 최만영 (국립식량과학원 간척지농업과) ;
  • 최용석 (충남농업기술원 농업환경연구과)
  • Received : 2012.01.30
  • Accepted : 2012.11.06
  • Published : 2012.12.01

Abstract

This study compared the Aphelinus varipes and Aphelinus asychis in terms of how they parasitized the cotton aphid, Aphis gossypii and green peach aphid, Myzus persicae. Host-feeding, parasitism, emergence, the proportion of females and development time were all studied at 15, 20, 25 and $30^{\circ}C$ in controlled climate cabinets. When A. gossypii were provided for the two aphid parasitoids, the number of aphids killed by host-feeding for A. varipes (5.4 and 9.7 aphids) at $15^{\circ}C$ and $25^{\circ}C$ was higher than those for A. asychis (2.0 and 2.9 aphids). At $15^{\circ}C$ and $30^{\circ}C$, the parasitized A. gossypii were higher in A. varipes (11.1 and 21 aphids) than in A. asychis (7 and 12.3 aphids). The emergence rate was also significantly different between A. varipes (83.3%) and A. asychis (69.4%). The proportion of females was higher for A. asychis (75.2 and 73.9%) than for A. varipes (19.5 and 48.6%) at $15^{\circ}C$ and $30^{\circ}C$, respectively. No significant differences were found in development time between the two parasitoids. When M. persicae were provided for the two parasitoid species, the host-feeding number and the emergence rate of two parasitoids were not different at all four temperatures. The M. persicae were more highly parasitized by A. varipes (12.1 and 17.1 aphids) than by A. asychis (6.1, 10 aphids) at 20 and $25^{\circ}C$. The proportion of females for A. varipes (65.3 and 90.0%) was higher than that for A. asychis (34.4 and 78.8%) at $15^{\circ}C$ and $25^{\circ}C$. The development time from oviposition to the adult emergence of A. varipes (19.9 d) was significantly longer than that of A. asychis (16.5 d) at $20^{\circ}C$. Development times decreased with increasing temperature for both in two parasitoid species.

Acknowledgement

Supported by : 국립농업과학원

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