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Incidence of Helicoverpa armigera (Lepidoptera: Noctuidae) and its natural enemies on smallholder crops in Kenya

  • H. van den Berg (a1), M. J. W. Cock (a1), G. I. Oduor (a2) and E. K. Onsongo (a2)

Smallholder crops (sunflower, maize, sorghum and cotton) were grown in experimental plots at seven sites, representing different agricultural zones of Kenya, over four seasons. Helicoverpa armigera (Hübner) (formerly Heliothis armigera) only occasionally achieved population densities sufficient to cause obvious damage to the crops, and was virtually absent from the coastal sites. At the inland sites, infestation and mortality levels varied greatly. Information is presented on the incidence of H. armigera, and the identity, distribution and frequency of its common parasitoids and (potential) predators, sampled in the experimental plots. Trichogrammatoidea spp., egg parasitoids, and Linnaemya longirostris (Macquart), a tachinid late-larval parasitoid, were the most common parasitoid species, but total percentage parasitism was rather low. Of the large complex of predators, only anthocorids and ants (predominantly Pheidole spp., Myrmicaria spp. and Camponotus spp.) were sufficiently common and widespread to be of importance in suppressing H. armigera. The abundance of predators fluctuated widely between sites, but anthocorids were most abundant at the western sites.

Corresponding author
International Institute of Biological Control, Silwood Park, Buckhurst Road, Ascot, Berks SL5 7TA, UK.
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Coaker, T.H. (1959) Investigations on Heliothis armigera (Hb.) in Uganda. Bulletin of Entomological Research 50, 487506.
Cock, M.J.W., van den Berg, H., Oduor, G.I. & Onsongo, E.K. (1991) The population ecology of Helicoverpa armigera in small-holder crops in Kenya, with emphasis on it natural enemies. Final report, Phase II. 179 pp. Ascot, UK, International Institute of Biological Control, Report.
Khaemba, B.M. & Mutinga, M.J. (1982) Insect pests of sun flower (Helianthus annuus L.) in Kenya. Insect Science and its Application 3, 281286.
McKinley, D.J. (1971) Nuclear polyhedrosis virus of the cotton bollworm in Central Africa. Cotton Growing Review 48, 297303.
Nyambo, B.T. (1990) Effect of natural enemies on the cotton bollworm, Heliothis armigera Hübner (Lepidoptera: Noctuidae) in western Tanzania. Tropical Pest Management 36, 5058.
Parsons, F.S. (1940a) Investigations on the cotton bollworm Heliothis armigera Hübn. (obsoleta Fabr.). II. The incidence of parasites in quantitative relation to bollworm populations in South Africa. Bulletin of Entomological Research 31, 89109.
Parsons, F.S. (1940b) Investigations on the cotton bollworm, Heliothis armigera, Hübn. Part III. Relationships between oviposition and the flowering curves of food-plants. Bulletin of Entomological Research 31, 147177.
Parsons, F.S. & Ullyett, G.C. (1934) Investigations on the control of the American and red bollworms of cotton in South Africa. Bulletin of Entomological Research 25, 349381.
Peat, J.E. (1935) Gatooma, Southern Rhodesia. pp 5174 in Progress Reports from Experiment Stations, Season 1933–1934. London, Empire Cotton Growing Corporation.
Reed, W. (1965) Heliothis armigera (Hb.) (Noctuidae) in western Tanganyika. II. Ecology and natural and chemical control. Bulletin of Entomological Research 56, 127140.
Rens, G.R. (1977) Interrelations and control of insects, attacking cotton and food crops, with particular reference to Heliothis armigera. pp. 8084 in De Lima, C.P.F. (Ed.) Advances in medical, veterinary and agricultural entomology in eastern Africa. Nairobi, Kenya, East African Literature Bureau.
van den Berg, H. & Cock, M.J.W. (1993) African bollworm and its natural enemies in Kenya. 49 pp. WallingfordC.A.B International for IIBC Kenya Station.
van den Berg, H. & Cock, M.J.W. (in press) Stage-specific mortality of Helicoverpa armigera in three smallholder crops in Kenya. Journal of Applied Ecology.
van den Berg, H., Waage, J.K. & Cock, M.J.W. (1988) Natural enemies of Helicoverpa armigera in Africa – a review. 81 pp. Ascot, UKC.A.B International Institute of Biological Control.
van den Berg, H., Litsinger, J.A., Shepard, B.M. & Pantua, P.C. (1992) Acceptance of eggs of Rivula atimeta, Naranga aenescens (Lep.: Noctuidae) and Hydrellia philippina (Dipt.: Ephydridae) by insect predators on rice. Entomophaga 37, 2128.
Wolfenbarger, D.A., Bodegas, P.R., Flores, R. (1981) Development of resistance in Heliothis spp. in the Americas, Australia, Africa, and Asia. Bulletin of the Entomological Society of America 27, 180185.
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Bulletin of Entomological Research
  • ISSN: 0007-4853
  • EISSN: 1475-2670
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