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Studies on the biology and taxonomy of some Chilocorus spp. (Coleoptera: Coccinellidae) preying on Aulacaspis spp. (Hemiptera: Diaspididae) in East Africa, with the description of a new species

Published online by Cambridge University Press:  10 July 2009

D. J. Greathead  and
R. D. Pope
D. J. Greathead
Affiliation:
Commonwealth Institute of Biological Control, 56 Queen's Gate, London SW7 5JR, U.K.
R. D. Pope
Affiliation:
Department of Entomology, British Museum (Natural History), Cromwell Road, London SW7 5BD, U.K.
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Abstract

Field studies of predators on Aulacaspis tegalensis (Zhnt.) and laboratory breeding experiments, supplemented by taxonomic studies, showed that Chilocorus discoideus Crotch and C. bilineata Korsch. are junior synonyms of C. schioedtei Muls. and that two other forms, originally described as ‘aberrations’, may also belong to this species. Similarly, C. erythrocephalus Muls. and C. solitus Weise are junior synonyms of C. distigma (Klug). C. rufoplagiatus sp. n., allied to C. distigma, is described from the shores of Lake Victoria, and the Oriental species C. nigritus (F.) is recorded from the African mainland for the first time. C. distigma is found in the savanna and steppe areas of Africa and C. schioedtei in the forest and adjoining zones. Comparative studies suggest that, although C. schioedtei has a higher fecundity, it is not displaced by C. distigma as, unlike the latter, it is unable to breed under hot dry conditions. Comparison of host records for these two species show that C. distigma is not restricted to feeding on Diaspididae, as is C. schioedtei, but that otherwise the range of hosts and associated plants is similar for both species. The potential of these species and C. nigritus for use in biological control is discussed and it is suggested that C. schioedtei is only suitable for trial in tropical areas without a dry season, but that C. distigma and C. nigritus may be useful under a wider range of conditions.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 67 , Issue 2 , June 1977 , pp. 259 - 270
Copyright
Copyright © Cambridge University Press 1977

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