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Genetic variation in Heliothis in Australia: species identification and gene flow in the two pest species H. armigera (Hübner) and H. punctigera Wallengren (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  10 July 2009

Joanne C. Daly  and
Peter Gregg
Joanne C. Daly
Affiliation:
CSIRO, Division of Entomology, G.P.O. Box 1700, Canberra, ACT 2601, Australia
Peter Gregg
Affiliation:
Department of Microbiology, University of New England, Armidale, NSW 2350, Australia
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Abstract

Genetic (electrophoretic) variation was examined in the two pest species of Heliothis found in Australia, H. armigera (Hübner) and H. punctigera Wallengren. They could be differentiated by seven loci which enabled identification of individual eggs and small larvae not normally distinguishable by their morphology. The traditional criteria for distinguishing the larger larvae of the two species were shown to be unreliable. The genetic distance between the two species was 0·34 ± 0·02. The percentage of loci polymorphic in both species, 32%, and the mean heterozygosities, 11·3% for H. armigera and 10·8% for H. punctigera, are lower than those reported in the American species, H. virescens (F.) and H. zea (Boddie). Populations throughout Australia were differentiated from each other, but there did not appear to be a marked geographic pattern to the variation. Genetic distances between populations of H. armigera were low (<0·01). It was concluded that the effective population size of Heliothis is large and that significant gene flow probably occurs between widely separated regions.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 75 , Issue 1 , March 1985 , pp. 169 - 184
Copyright
Copyright © Cambridge University Press 1985

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