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The reproductive maturity and mating status of Helicoverpa armigera, H. punctigera and Mythimna convecta (Lepidoptera: Noctuidae) collected in tower-mounted light traps in northern New South Wales, Australia

Published online by Cambridge University Press:  10 July 2009

M. Coombs
Affiliation:
Department of Zoology, University of New England, NSW, Australia
A. P. Del Socorro
Affiliation:
Department of Agronomy and Soil Science, University of New England, NSW, Australia
G. P. Fitt
Affiliation:
CSIRO Division of Entomology, Narrabri, NSW, Australia
P. C. Gregg*
Affiliation:
Department of Agronomy and Soil Science, University of New England, NSW, Australia
*
Dr P.C. Gregg, Department of Agronomy and Soil Science, University of New England, Armidale, NSW, Australia, 2351.

Abstract

The reproductive condition and mating status of female Helicoverpa armigera (Hübner), H. punctigera (Wallengren) and the mating status of the armywormMythimna convecta (Walker), trapped in tower-mounted light traps were studied over a four and a half year period, from November 1985 to December 1989. The traps were mounted on towers (40 and 50 m high) in two geographically distinct sites, one located at Point Lookout and the other at Mt Dowe both in north-eastern New South Wales, Australia. At the Point Lookout site, 132 females of H. armigera and 366 of H. punctigera were examined and of those, 88.7% and 89.9% were unmated and immature, respectively. Most of the remaining females of both species were mature and mated. Of the matedH. armigerafemales, 78.6% carried only a single spermatophore, the remainder having either two or three spermatophores. Most of the matedH. punctigerafemales (97.1%) carried only a single spermatophore and the remainder had no more than two. Females ofM. convectawere predominantly (97.1%) unmated. At the Mt Dowe siteH. punctigeraadults were predominant and all 44 females of this species examined were unmated and non-gravid. Pre-reproductive flight byHelicoverpaspp. andM. convectais considered as an important component of the life-history strategies of these insects. Flexibility in the timing and spacing of reproductive effort is seen as enabling colonization of heterogeneous environments.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1993

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