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Lack of intraspecific biological variation between two geographical populations of Oomyzus sokolowskii (Hymenoptera: Eulophidae), a gregarious larval–pupal parasitioid of Plutella xylostella (Lepidoptera: Plutellidae)

Published online by Cambridge University Press:  09 March 2007

A.R. Mahmood ,
S.S. Liu ,
Z.H. Shi ,
X.H. Song  and
M.P. Zalucki
A.R. Mahmood
Affiliation:
Institute of Applied Entomology, Zhejiang University, Hangzhou 310029, China
S.S. Liu*
Affiliation:
Institute of Applied Entomology, Zhejiang University, Hangzhou 310029, China
Z.H. Shi
Affiliation:
Institute of Applied Entomology, Zhejiang University, Hangzhou 310029, China
X.H. Song
Affiliation:
Institute of Applied Entomology, Zhejiang University, Hangzhou 310029, China
M.P. Zalucki
Affiliation:
School of Life Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
*
*Fax: 86 571 86049815 E-mail: [email protected]
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Abstract

The chalcid, Oomyzus sokolowskii Kurdjumov has been recorded in many parts of the world as a major larval–pupal, gregarious endoparasitoid of the diamondback moth, Plutella xylostella (Linnaeus), a serious pest of brassica vegetable crops worldwide. This study investigated intraspecific variation between two populations of O. sokiolowskii, one from Cape Verde Islands, West Africa and the other from Hangzhou, China. In all crosses and backcrosses between the two geographical populations, the numbers of progeny and sex ratio of progeny were similar to those obtained within each of the populations, demonstrating complete reproductive compatibility between the two populations. The two populations showed similar responses to temperature with respect to development time and survival of immature stages. Observations on the interactions between the two O. sokolowskii populations and Cotesia plutellae (Kurdjumov), another major parasitoid of P. xylostella, showed that neither population could achieve successful parasitism of P. xylostella larvae already parasitized by C. plutellae. However, both O. sokolowskii populations could achieve hyperparasitism by ovipositing into a mid-late stage larva of C. plutellae developing inside the primary host. Contrary to earlier reports, no evidence of intraspecific variations in ability to hyperparasitize between these two populations of O. sokolowskii was found.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 94 , Issue 2 , April 2004 , pp. 169 - 177
Copyright
Copyright © Cambridge University Press 2004

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