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Migration and low population density in armyworm (Lepidoptera: Noctuidae) life histories

Published online by Cambridge University Press:  19 September 2011

A. G. Gatehouse
A. G. Gatehouse
Affiliation:
School of Animal Biology, University College of North Wales, Bangor, Gwynedd LL57 2UW, U.K.
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Abstract

Field and laboratory evidence now suggests that the African armyworm, Spodoptera exempta, is specifically adapted for survival at low population densities, providing a new basis for understanding the significance of its phase polyphenism and migratory strategy. This conclusion allows deductions to be made as to the expected extent of displacement of flying moths from low and, when they occur as a result of impeded or inadequate dispersal of parent moths, high density populations. The proposed migratory strategy which depends on the genetic determination of flight potential also provides a framework for interpreting observed patterns of armyworm outbreaks through the season and in relation to rainfall. Traits associated with a low-density, “armyworm” strategy are shared by other Noctuids which may have similar life histories.

Résumé

Les données de laboratoire et de terrain montrent que la légionnaire africaine, Spodoptera exempta, est spécifiquement adaptée pour survivre dans les conditions de faible densité offrant ainsi une nouvelle structure de base pour comprendre la signification du polyphénisme de phase et la stratégie migratoire de cette espèce. Ceci nous permet de prédire l'étendue des déplacements migratoires des adultes chez les populations de faible densité de même que chez celles de forte densité où la dispersion de la génération précédente a été limitée. La stratégie migratoire proposée, fondée sur une détermination génétique du vol, offre aussi une nouvelle base pour interpréter les épidemies saisonnières, associées avec le phénomène des pluies chez la légionnaire. Les traits qui sont associés à la stratégie pendant les conditions de faible densité sont aussi rencontrés chez d'autres Noctuides qui partagent les mêmes modes de vie.

Keywords

Spodoptera exemptaNoctuidaeAfrican armywormflightmigrationdispersalphase polyphenismpopulation densitygenetics of flight potentialheritabilityevolution of migrationlife history strategiescontrolSpodoptera exemptaNoctuidaelégionnaire africainevolmigrationdispersionpolyphénisme de phasedensité des populationsdétermination génétique du volévolution de migrationmodes de vielutte
Type
Symposium IV: Migration and Dispersal of Tropical Noctuid Moths
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 4-5-6: Recent Advances in Research on Tropical Entomology , December 1987 , pp. 573 - 580
Copyright
Copyright © ICIPE 1987

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References

REFERENCES

Aidley, D. J. (1974) Migratory capability of the African armyworm moth, Spodoptera exempta (Walker). East Afr. agric. For. J. 40, 202–203.Google Scholar
Brown, E. S., Betts, E. and Rainey, R. C. (1969) Seasonal changes in distribution of the African armyworm, Spodoptera exempta (Wlk.) (Lep., Noctuidae), with special reference to eastern Africa. Bull. Ent. Res. 58, 661–728.CrossRefGoogle Scholar
Davis, M. A. (1980) Why are most insects short fliers? Evol. Theor. 5, 103–111.Google Scholar
Gatehouse, A. G. (1986) Migration in the African armyworm Spodoptera exempta: genetic determination of migratory capacity and a new synthesis. In Insect Flight, Dispersal and Migration. (Edited by Danthanarayana, W.), pp. 128–144. Springer Verlag, Heidelberg.Google Scholar
Gatehouse, A. G. and Hackett, D. S. (1980) A technique for studying flight behaviour of tethered Spodoptera exempta moths. Physiol. Ent. 5, 215–222.CrossRefGoogle Scholar
Gatehouse, A. G. and Woodrow, K. P. (1987) Simultaneous monitoring of flight and oviposition of individual velvetbean caterpillar moths (by Wales, Barfield & Leppla, 1985): a critique. Physiol. Ent., 12, 117–121.Google Scholar
Gruys, P. (1970) Growth In Bupalus pinniarius (Lepidoptera: Geometridae) in relation to larval density. Verh. Rijksinst. Naturbeheer. 1, 1–127.Google Scholar
Gunn, A. and Gatehouse, A. G. (1985) Effects of larval and adult food and water uptake on reproduction in the African armyworm. Spodoptera exempta (Walker) (Lepidoptera, Noctuidae). Physiol. Ent. 10, 53–63.CrossRefGoogle Scholar
Gunn, A. and Gatehouse, A. G. (1986) The effect of adult feeding on lipid and protein reserves in African armyworm, Spodoptera exempta, moths before and during reproduction. Physiol. Ent. 11, 423–431.CrossRefGoogle Scholar
Haggis, M. J. (1984) Distribution, Frequency of Attack and Seasonal Incidence of the African Armyworm, Spodoptera exempta (Walk?) (Lep.: Noctuidae), with Particular Reference to Africa and South-western Arabia. Tropical Development and Research Institute, London. L69.Google Scholar
Hattingh, C. C. (1941) The biology and ecology of the armyworm (Laphygma exempta) and its control in South Africa. Dep. Agric. For. Sth Afr. Sci. Bull. No. 217.Google Scholar
Hebert, P. D. N. (1983) Egg dispersal patterns and adult feeding behaviour in the Lepidoptera. Can. Ent. 115, 1477–1481.Google Scholar
Johnson, C. G. (1976) Lability of the flight system: a context for functional adaptation. In Insect Flight (Edited by Rainey, R. C.), pp. 217–234. Royal Entomological Society of London Symposium No. 7. Blackwell, Oxford.Google Scholar
Nyirenda, G. K. C. (1985) Persistent populations of males of the African armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae) in Malawi. Bull. ent. Res. 75, 405–415.Google Scholar
Oku, T. and Kobayashi, T. (1978) Migratory behaviour and life cycle of noctuid moths (Insecta: Lepidoptera) with notes on recent status of migrant species in northern Japan. Bull. Tohoku Nat. Agric. Exp. Stn. 58, 97–209 (in Japanese: English summary).Google Scholar
Page, W. W. (1985) Oocyte development in the African armyworm, Spodoptera exempta. M.Sc. thesis, University of Wales.Google Scholar
Parker, W. E. and Gatehouse, A. G. (1985a) The effect of larval rearing conditions on flight performance in females of the African armyworm, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull. ent. Res. 75, 35–47.Google Scholar
Parker, W. E. and Gatehouse, A. G. (1985b) Genetic factors controlling flight performance and migration in the African armyworm moth, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull. ent. Res. 75, 49–63.Google Scholar
Pedgley, D. E., Reynolds, D. R., Riley, J. R. and Tucker, M. R. (1982) Flying insects reveal small-scale wind systems. Weather, Lond. 37, 295–306.Google Scholar
Rainey, R. C. (1985) Insect flight: new facts—and old fantasies? In Insect Locomotion. (Edited by Gewecke, M. and Wendler, G.), pp. 241–244. Verlag Paul Parey, Berlin.Google Scholar
Riley, J. R., Reynolds, D. R. and Farmery, M. J. (1981) Radar observations of Spodoptera exempta, Kenya, March–April 1979. Miscellaneous Report No. 54. Centre for Overseas Pest Research (Overseas Development Administration), London.Google Scholar
Riley, J. R., Reynolds, D. R. and Farmery, M. J. (1983) Observations of the flight behaviour of the armyworm moth, Spodoptera exempta, at an emergence site using radar and infra-red optical techniques. Ecol. Ent. 8, 395–418.Google Scholar
Rose, D. J. W. (1975) Field development and quality changes in successive generations of Spodoptera exempta Wlk., the African armyworm. J. appl. Ecol. 12, 727–739.Google Scholar
Rose, D. J. W. (1979) The significance of low-density populations of the African armyworm Spodoptera exempta (Walk.). Phil. Trans. R. Soc. B287, 245–488.Google Scholar
Rose, D. J. W. and Dewhurst, C. F. (1979) The African armyworm, Spodoptera exempta—congregation of moths in trees before flight. Ent. exp. et appl. 26, 346–348.Google Scholar
Rose, D. J. W., Page, W. W., Dewhurst, C. F., Riley, J. R., Reynolds, D. R., Pedgley, D. E. and Tucker, M. R. (1985) Downwind migration of the African armyworm moth, Spodoptera exempta, studied by mark-and-capture and by radar. Ecol. Ent. 10, 299–313.Google Scholar
Southwood, T. R. E. (1977) Habitat, the template for ecological strategies? J. Anim. Ecol. 46, 337–365.Google Scholar
Southwood, T. R. E. (1981) Ecological aspects of insect migration. In Animal Migration (Edited by Aidley, D. J.), pp. 197–208. Society for Experimental Biology Seminar Series No. 13, Cambridge University Press, Cambridge.Google Scholar
Tucker, M. R. (1983) Light-trap catches of African armyworm moths Spodoptera exempta (Walker) (Lepidoptera: Noctuidae) in relation to rain and wind. Bull. ent. Res. 73, 315–319.Google Scholar
Tucker, M. R. and Pedgley, D. E. (1983) Rainfall and outbreaks of the African armyworm Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull. ent. Res. 73, 195–199.Google Scholar
Tucker, M. R., Mwandoto, S. and Pedgley, D. E. (1982) Further evidence for the windborne movement of armyworm moths, Spodoptera exempta, in East Africa. Ecol. Ent. 7, 463–473.Google Scholar
Whellan, J. A. (1954) The African armyworm and its control. Rhod. agric. J. 51, 414–427.Google Scholar
Whellan, J. A. (1960) Armyworm. Report of the Seventh Commonwealth Entomological Conference 6–15th July, 1960, London, pp. 267–268.Google Scholar
Woodrow, K. P., Gatehouse, A. G. and Davies, D. A. (1987) The effect of larval phase on flight performance of African armyworm moths, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae). Bull. ent. Res. 77, 113–122.Google Scholar
Yarro, J. G. (1982) The growth, development and survival of Spodoptera exempta (Walk.) (Lepidoptera: Noctuidae) on some selected grass species. Ph.D. thesis, University of Dar es Salaam, Tanzania.Google Scholar