Abstract
Screen house studies on the incidence and yield losses in three cowpea (Vigna unguiculata) varieties, TVx 3236, Ife Brown and Ife Bimpe due to the leaf beetle Ootheca mutabilis Sahl were carried out. Artificial infestation was done at two growth stages of cowpea: the 5-leaf stage (2 weeks after emergence) and 4 weeks after emergence. Variety TVx3236 was found to be the least susceptible, while var. Ife Bimpe was the most susceptible to leaf beetle damage. Young plants were more susceptible than older ones.
Flowering was delayed in plants infested with beetles and the extent of defoliation had a pronounced effect on the yield of cowpea.
The percentage grain yield loss ranged from 19.48% to 59.77% depending on level of beetle infestation, variety and age of the plant at infestation.
Résumé
Des études ont été menées en serres de criblage, afin de déterminer l’incidence et la perte en rendements chez trois variétés (TVx3236, Ife Brown et Ife Bimpe) de niébé (Vigna unguiculata), suite à l’attaque parla chrysomèle mineuse des feuilles, Ootheca mutabilis Sahl. (Coleoptera: Chrysomelidae). L’infestation artificielle des plantes a été faite à deux différentes périodes de croissance du niébé: à 2 et à 4 semaines après la levée. La variété TVx3236 était la plus résistante, tandis que la variété Ife Bimpe fut la plus sensible à l’attaque due au coléoptère. Les jeunes plants étaient plus sujets à l’attaque que ceux à l’âge avancé, peu importe la variété. La floraison était retardée chez les plants attaqués et l’importance de la défoliation avait un effet marqué sur les rendements du niébé.
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References
Chant S. R. (1959) Viruses of cowpeas, Vigna unguiculata Walp. in Nigeria. Ann. Appl. Biol. 47, 565–572.
Horber E. (1980) Types and classification of resistance, pp. 15–22. In Breeding Plants Resistant to Insects (Edited by F. G. Maxwell and P. R. Jennings). John Wiley and Sons, New York, Chichester, Toronto.
Okigbo B. N. (1978) Grain legumes in the agriculture of the tropics, pp. 41–49. In Pests of Grain Legumes: Ecology and Control (Edited by S. R. Singh, H. F. van Emden and T. A. Taylor). Academic Press, London / New York.
Raheja A. K. (1981) Status of Ootheca mutabilis as a pest of cowpea in northern Nigeria. Samaru Agrie. Res. 1, 111–118.
Shoyinka S. A. (1974) Status of virus diseases of cowpea in Nigeria, pp. 171–190. In Proc. of the 1st IITA Grain Legume Improvement Workshop, IITA, Ibadan. International Instituteof Tropical Agriculture (IITA) Ibadan, Nigeria.
Singh S. R. and Emden H. F. van (1979) Insect pests of grain legumes. Annu. Rev. Entornol. 24, 255–278.
Steele G. R. D. and Torrie J. H. (1980) Principles and Procedures of Statistics—A Biometric Approach. 2nd Ed. McGraw-Hall Book Company, Auckland, London, Tokyo, 633 pp.
Steele W. M. (1972) Cowpeas in Nigeria. Thesis submitted for the Doctorate degree of the University of Reading, UK.
Steele W. M., Allen D. J. and Summerfield R. J. (1985) Cowpea (Vigna unguiculata L. Walp), pp. 65–69. In Grain Legume Crops (Edited by R. J. Summerfield and E. H. Roberts). Academic Press, New York/ London.
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Ashamo, M.O. Incidence and Yield Losses in Three Cowpea Varieties Due to the Leaf Beetle, Ootheca mutabilis Sahl. Int J Trop Insect Sci 18, 257–260 (1998). https://doi.org/10.1017/S1742758400023493
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DOI: https://doi.org/10.1017/S1742758400023493