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Assessment of key factors responsible for the pest status of the bean flower thrips Megalurothrips sjostedti (Thysanoptera: Thripidae) in West Africa

Published online by Cambridge University Press:  10 July 2009

M. Tamò ,
J. Baumgärtner ,
V. Delucchi  and
H.R. Herren
M. Tamò*
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, Cotonou, Republic of Benin
J. Baumgärtner
Affiliation:
Institute of Plant Sciences, Division of Phytomedicine, Swiss Federal Institute of Technology, Zurich, Switzerland
V. Delucchi
Affiliation:
Institute of Plant Sciences, Division of Phytomedicine, Swiss Federal Institute of Technology, Zurich, Switzerland
H.R. Herren
Affiliation:
Plant Health Management Division, International Institute of Tropical Agriculture, Cotonou, Republic of Benin
*
Manuele Tamò, Biological Control Center for Africa, IITA, B. P. 08-0932, Cotonou, Republic of Benin
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Abstract

Megalurothrips sjostedti (Trybom) is an important pest of cowpea (Vigna unguiculata) in West Africa. Three key factors assumed to be responsible for its pest status are analysed, the survival on alternative host-plants during the dry season, the inefficient biotic mortality factors regulating population growth, and the effect of larval feeding on the development of cowpea flower buds. Extensive surveys indicate clearly that M. sjostedti survives the dry season on a wide range of alternative hosts all belonging to the Leguminosae, where it can feed and reproduce. Different antagonists were observed attacking eggs and larvae of M. sjostedti; their impact, however, is low and cannot prevent pest outbreaks. Two undescribed Megaphragma spp., and one Oligosita sp., all trichogrammatid egg parasitoids, were recorded for the first time. The anthocorid Orius sp. was the most important larval predator. No hymenopterous parasitoids could be reared from larvae collected on cowpea and three major alternative hosts, whereas a low percentage of the larvae collected from the flowers of Tephrosia candida, an exotic shrub native to India, were parasitized by the eulophid Ceranisus menes (Walker), also recorded for the first time in Africa. The feeding activity of six larvae of Megalurothrips sjostedti during five days induced the shedding of all flower buds of a cowpea inflorescence. The results of the analysis shed new light on the M. sjostedti pest problem, and the ways to solve it. The lack of efficient antagonists, particularly larval parasitoids known from closely related south-east Asian Megalurothrips spp., and the high damage threshold, indicate that M. sjostedti is a potential target for biological control. However, further studies are needed to investigate the migration of M. sjostedti adults to and from alternative host-plants, in order to reinforce the action of biocontrol with cultural pratices.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 83 , Issue 2 , June 1993 , pp. 251 - 258
Copyright
Copyright © Cambridge University Press 1993

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References

Agyen-Sampong, M. (1978) Pests of cowpea and their control in Ghana. pp. 85–92in Singh, S.R., Van Emden, H.F. & Taylor, T.A. (Eds) Pests of grain legumes: ecology and control. London, Academic Press.Google Scholar
Ananthakrishnan, T.N. (1973) Thrips: biology and control. 120 pp. DelhiMacMillan.Google Scholar
Booker, R.H. (1965) Pests of cowpea and their control in northern Nigeria. Bulletin of Entomological Research 55, 663–672.CrossRefGoogle Scholar
Chang, N.T. (1990) Ceranisus menes (Walker) (Eulophidae: Hymenoptera), a new parasite of bean flower thrips, Megalurothrips usitatus (Bagnall) (Thripidae: Thysanoptera). Plant Protection Bulletin 32, 237–238.Google Scholar
Clausen, C.P. (1972) Entomophagous insects. 688 pp. New York, Hafner Publishing Company.Google Scholar
Ezueh, M.I. (1981) Nature and significance of preflowering damage by thrips to cowpea. Entomologia Experimentalis et Applicata 29, 305–312.CrossRefGoogle Scholar
Faure, J.C. (1960) Thysanoptera of Africa, 3: Taeniothrips sjostedti (Trybom), 1908. Journal of the Entomological Society of South Africa 23, 34–44.Google Scholar
Fullaway, D.T. & Dobroscky, I.D. (1934) A new Thripoctenus parasite from the Philippines. Proceedings of the 5th Pacific Scientific Congress Canada 1933 5, 3439–3444.Google Scholar
Gahan, A.B. (1932) Miscellaneous descriptions and notes on parasitic Hymenoptera. Annals of the Entomological Society of America 25, 736–757.CrossRefGoogle Scholar
Ghauri, M.S.K. (1980) Notes on Anthocoridae (Heteroptera) with description of two new species of economic importance from Africa. Bulletin of Entomological Research 70, 287–291.CrossRefGoogle Scholar
Haug, T. & Megevand, B.. (in press) A new rearing unit for the mass-production of cassava mealybugs, green mites, and their natural enemies. Proceedings of the 2nd International Conference of Tropical Entomology, ICIPE, Nairobi, Kenya, 07 31– 08 4, 1989.Google Scholar
Hessein, N.A. & McMurtry, J.A. (1988) Observations on Megaphragma mymaripenne (Hymenoptera: Trichogrammatidae), an egg parasite of Heliothrips haemorrhoidalis Bouché (Thysanoptera: Thripidae). Pan Pacific Entomologist 64, 250–254.Google Scholar
Hutchison, L.D. & Dalziel, M.D. (1958) Flora of west tropical Africa. Vol. I, Part II. pp. 292–828. London and Tonbridge, The Whitefriars Press Ltd.Google Scholar
Kalshoven, L.G.E. & Van Der Vecht, J.. (1950) De plagen van de culturgewassen in Indonesië. 512 pp. Van Hoeve, La Haye.Google Scholar
Letourneau, D.K. & Altieri, M.A. (1983) Abundance patterns of a predator, Orius tristicolor (Hemiptera: Anthocoridae) and its prey Frankliniella occidentalis (Thysanoptera: Thripidae): habitat, attraction in polyculture versus monoculture. Environmental Entomology 12, 1464–1469.CrossRefGoogle Scholar
Lewis, T.. (1973) Thrips: their biology, ecology, and economic importance. 349 pp. London, Academic Press.Google Scholar
Litsinger, J.A., Quirino, C.B., Lumaban, M.D. & Bandong, J.P. (1978) Grain legume pest complex in rice-based cropping systems at three locations in the Philippines. pp. 309–320in Singh, S.R., Van Emden, H.F. & Taylor, T.A. (Eds) Pests of grain legumes: ecology and control. London, Academic Press.Google Scholar
McMurtry, J.A. (1961) Current research on biological control of avocado insect and mite pests. Yearbooks of the California Avocado Society 45, 104–106.Google Scholar
Nyiira, Z.M. (1971) The status of insect pests on cowpea, Vigna unguiculata (L.) Walp. in Uganda and their control. PANS 17, 194–197.Google Scholar
Nyiira, Z.M. (1973) Pest status of thrips and lepidopterous species on vegetables in Uganda. East African Agricultural Forestry Journal 39, 131–135.CrossRefGoogle Scholar
Ojehomon, O.O. (1968) The development of the inflorescence and extra-floral nectaries of Vigna unguiculata (L.) Walp. Journal of the West African Science Association 13, 93–111.Google Scholar
Okwakpam, B.A. (1967) Three species of thrips in cowpea flowers in the dry season at Badeggi, Nigeria. Nigerian Entomologist Magazine 3, 45–46.Google Scholar
Palmer, J.M. (1987) Megalurothrips in the flowers of tropical legumes: a morphometric study. pp. 480–495in Holman, J., Pelikan, J., Dixon, A.G.F. & Weismann, L.. (Eds) Population structure, genetics and taxonomy of aphids and Thysanoptera. The Hague, SPB Academic Publishing.Google Scholar
Rösingh, C.. (1980) Untersuchungen über die Resistenz der Kuherbse, Vigna unguiculata (L.) Walp., gegen Megalurothrips sjostedti (Trybom) (Thysanoptera: Thripidae). PhD thesis, University of Hohenheim, Germany.Google Scholar
Salifu, A.B. (1986) Studies on aspects of the biology of the flower thrips, Megalurothrips sjostedti (Trybom) with particular reference to resistance in host cowpea, Vigna unguiculata (L.) Walp. PhD thesis, Wye College, University of London, England.Google Scholar
Singh, S.R. & Taylor, T.A. (1978) Pests of grain legumes and their control in Nigeria. pp. 99–111in Singh, S.R., Van Emden, H.F. & Taylor, T.A. (Eds) Pests of grain legumes: ecology and control. London, Academic Press.Google Scholar
Singh, S.R., Jackai, L.E.N., Dos Santos, J.H.R. & Adalla, C.B. (1990) Insect pests of cowpea. pp. 43–89in Singh, S.R. (Ed.) Insect pests of tropical food legumes. Chichester, John Wiley & Sons.Google Scholar
Southwood, T.R.E. (1978) Ecological methods. 2nd edn., 524 pp. London, Chapman & Hall.Google Scholar
Tamò, M.. (1991) The interactions between the cowpea (Vigna unguiculata Walp.) and the bean flower thrips (Megalurothrips sjostedti Trybom) in Rep. of Benin. PhD. Thesis no. 9455, Swiss Federal Institute of Technology, Zurich, Switzerland.Google Scholar
Tamò, M. & Baumgärtner, J.. (1993) Analysis of the cowpea (Vigna unguiculata Walp.) monocropping system in West Africa: I. A demographic model for carbon acquisition and allocation in cowpea. Ecological Modelling 65, 95–121.CrossRefGoogle Scholar
Tamò, M., Baumgärtner, J. & Gutierrez, A.P. (in press) Analysis of the cowpea (Vigna unguiculata Walp.) monocropping system in West Africa: II. Modelling the interactions between cowpea and the bean flower thrips Megalurothrips sjostedti (Trybom). Ecological Modelling.Google Scholar
Taylor, T.A. (1965) Observations on the bionomics of Laspeyresia ptychora Meyr. (Lepidoptera: Eucosmidae) infesting cowpea in Nigeria. Bulletin of Entomological Research 55, 761–773.CrossRefGoogle Scholar
Taylor, T.A. (1969) On the population dynamics and flight activity of Taeniothrips sjostedti (Trybom) (Thysanoptera: Thripidae) on cowpea. Bulletin of the Entomological Society of Nigeria 2, 60–71.Google Scholar
Taylor, T.A. (1974) On the population dynamics of Taeniothrips sjostedti (Trybom) (Thysanoptera: Thripidae) on cowpea and an alternate host, Centrosema pubescens Benth., in Nigeria. Revue de Zoologie Africaine 88, 689–702.Google Scholar
Trybom, F.. (1908) Physapoda. in Syöstedt, Y.. (Ed.) Wissenschaftliche Ergebnisse einer Schwedischen Zoologischen Expedition nach dem Kilimandjiaro, dem Meru, und den umgebenden Masaisteppen Deutsch-Ostafrica, 1905–1906 3, 1–22.Google Scholar
Van Halteren, P.. (1971) Insect pests of cowpea, Vigna unguiculata (L.) Walp. in the Accra plains. Ghana Journal of Agriculutral Science 4, 121–123.Google Scholar
Wien, H.C. & Rösingh, C.. (1980) Ethylene evolution by thrips-infested cowpea provides a basis for thrips resistance screening with ethephon sprays. Nature, London 283, 192–194.CrossRefGoogle Scholar