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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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B.T. Nyambo (1990) Effect of natural enemies on the cotton bollworm, Heliothis armigera Hübner (Lepidoptera: Noctuidae) in western Tanzania. Tropical Pest Management 36, 5058.

H. van den Berg , J.A. Litsinger , B.M. Shepard & P.C. Pantua (1992) Acceptance of eggs of Rivula atimeta, Naranga aenescens (Lep.: Noctuidae) and Hydrellia philippina (Dipt.: Ephydridae) by insect predators on rice. Entomophaga 37, 2128.

D.A. Wolfenbarger , P.R. Bodegas , R. Flores (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
  • URL: /core/journals/bulletin-of-entomological-research
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