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All-female broods in field and laboratory populations of the Egyptian cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae)

Published online by Cambridge University Press:  10 July 2009

Linda C. Brimacombe
Linda C. Brimacombe
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ, UK
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Abstract

Egg-batches of Spodoptera littoralis (Boisd.) collected in Crete showed an abnormal sex ratio; 24% yielded predominantly female adults. The field data and data from nine generations of a laboratory strain, which also produced predominantly female offspring, showed that this abnormal condition was transmitted between generations by the females. The mean percentage hatch of egg-batches collected from the field which produced females only was 59·6, and the mean percentage hatch of the eggs of the laboratory strain was 58·8. These results suggest that the production of females only is a result of the mortality of the male embryos. Occasionally, abnormal females from the laboratory strain reverted to producing offspring of both sexes. This recovery from the abnormal condition became more common as successive generations were bred in the laboratory. One female of a normal strain produced all-female offspring and descendants of this female were similarly affected. The females of the unisexual laboratory strain were similar in appearance to normal females but laid significantly smaller egg-batches.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 70 , Issue 3 , September 1980 , pp. 475 - 481
Copyright
Copyright © Cambridge University Press 1980

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References

Chanter, D. O. & Owen, D. F. (1972). The inheritance and population genetics of sex ratio in the butterfly Acraea encedon.—J. Zool. 166, 363–383.Google Scholar
Clarke, C., Sheppard, P. M. & Scali, V. (1975). All-female broods in the butterfly Hypolimnas bolina (L.).—Proc. R. Soc. (B) 189, 29–37.Google Scholar
Earle, N. W. & MacFarlane, J. (1968). A unisexual strain of the salt-marsh caterpillar, Estigmene acraea.—Ann. ent. Soc. Am. 61, 949–953.Google Scholar
Geier, P. W. & Briese, D. T. (1977). Predominantly female progeny in the light-brown apple moth.—Search (Sydney) 8, 83–85.Google Scholar
Geier, P. W., Briese, D. T. & Lewis, T. (1978). The light-brown apple moth, Epiphyas postvittana (Walker). 2. Uneven sex ratios and a condition contributing to them in the field.—Aust. J. Ecol. 3, 467–488.CrossRefGoogle Scholar
Ikeda, H. (1970). The cytoplasmically-inherited ‘sex-ratio’ condition in natural and experimental populations of Drosophila bifasciata.—Genetics. Princeton 65, 311–333.CrossRefGoogle ScholarPubMed
Lanier, G. N. & Oliver, J. H. (1966). “Sex-ratio” condition: unusual mechanism in bark beetles.—Science, N. Y. 153, 208–209.CrossRefGoogle ScholarPubMed
Magni, G. E. (1953). ‘Sex ratio’: a non-Medelian character in Drosophila bifasciata—Nature, Lond. 172, 81.CrossRefGoogle Scholar
Matsuka, M., Hashi, H. & Okada, I. (1975). Abnormal sex-ratio found in the lady beetle, Harmonia axyridis PALLAS (Coleoptera: Coccinellidae).—Appl. Entomol. Zool. 10, 84–89.CrossRefGoogle Scholar
Owen, D. F. (1974). Seasonal change in sex ratio in Acraea quirina (F.) (Lep. Nymphalidae), and notes on the factors causing distortions of the sex ratio in butterflies.—Entomol. Scand. 5, 110–114.CrossRefGoogle Scholar
Owen, D. F & Chanter, D. O. (1969). Population biology of tropical African butterflies Sex ratio and genetic variation in Acraea encedon.—J. Zool. 157, 345–374.CrossRefGoogle Scholar
Poulson, E. B. & Sakaguchi, B. (1961). Nature of “sex ratio” agent in Drosophila.—Science. N. Y. 133, 1489–1490.CrossRefGoogle ScholarPubMed
Poulton, E. B. (1924). Mimicry in the butterflies of Fiji considered in relation to the Euploeine and Danaine invasions of Polynesia and the female forms of Hypolimnas bolina L. in the Pacific.—Trans. R. ent. Soc. Lond. 1923, 564–691.Google Scholar
Salama, A. E., Abdellatif, M. A & Bakry, N. M. S. (1971). Development differentiation of the reproductive system in the cotton leaf worm Spodoptera littoralis (Bois.).—Z. angew. Ent. 68, 308–314.Google Scholar
Simmonds, H. W. (1931). Further notes on Hypolimnas bolina, L., in Fiji.—Proc. R. ent. Soc. Lond. 5, 75–77.Google Scholar
Smith, D. A. S. (1975). All-female broods in the polymorphic butterfly Danaus chrysippus L., and their ecological significance.—Heredity, Lond. 34, 363–371.Google Scholar