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International Journal of Tropical Insect Science

, Volume 7, Issue 6, pp 781–784 | Cite as

Infestation Potential of Callosobruchus maculatus (Fab.) (Coleoptera:Bruchidae) on Cowpea Cultivars Stored Under Subtropical Conditions

  • G. W. K. Mensah
Research Article

Abstract

Laboratory studies were conducted to assess the infestation potential of Callosobruchus maculatus (Fab.) on 12 elite and one local cowpea cultivars which were stored under subtropical conditions. Index of susceptibility, loss in grain quality and the number of adult progeny that emerged from previously infested grain were the criteria used to assess the vulnerability of the cowpeas to post-harvest infestation. Cultivars TV × 309-1C and TV × 1193-10F showed some degree of resistance to post-harvest infestation by C. maculatus and could therefore be stored safely for a relatively long time. TV × 1192-01D and TV × 1999-ID were the most susceptible cultivars to post-harvest attack by C. maculatus. Length of storage adversely affected the ability of the cultivars to resist the insect attack. Crop resistance, adequately supplemented with good sanitation, can be profitably applied to control insect infestations in grains during storage.

Key Words

Cowpea weevil cowpea cultivars post-harvest infestation susceptibility index quality loss crop resistance 

Résumé

Des études de laboratories furent menées pour mesurer la susceptibilité de douze variétés élites et une variété locale de haricots, aux attaques de Callosobruchus maculatus (Fab.). Les trois critères suivants furent utilisés pour mesurer la vulnérabilité des variétés de haricots aux infestations d’apres récolte: l’index de susceptibilité, la diminution de la qualité du grain et le nombre dejeunes adultes insectes qui sortent des grains infestés. Les variétés TV × 309-1C et TV × 1192-10F se sont révélées resistantes. Elles peuvent être stockées pour une période assez longue. Les variétés TV × 1192-01D et TV × 1999-1D étaient les plus vulnérables. La résistance à l’insecte diminue avec la durée de stockage. La résistance de certaines variétés, combinée à de bonnes conditions d’hygiène, pourrait contribuer à réduire les infestations de grains par les insectes, durant la période de stockage.

Mots Clefs

Charançon de haricot variétés de haricots infestation d’apres récolte index de susceptibilité diminution de qualité résistance de plante 

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References

  1. Caswell G. H. (1970) The storage of cowpeas in the Northern States of Nigeria. Samaru Research Bulletin No. 120. Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria.Google Scholar
  2. Dobie P. (1974) The laboratory assessment of the inherent susceptibility of maize varieties to post-harvest infestation by Sitophilus zeamais Motsch. (Coleoptera, Curculionidae). J. stored Prod. Res. 10, 183–197.CrossRefGoogle Scholar
  3. Dobie P. (1977) The contribution of Tropical Stored Products Centre to the study of insect resistance in stored maize. Trop, stored Prod. Inform. 34, 7–22.Google Scholar
  4. Nwanze K. F. and Horber E. (1975) Laboratory techniques for screening cowpeas for resistance to Callosobruchus maculatus. Environ. Ent. 4, 415–419.CrossRefGoogle Scholar
  5. Wallace H. A. H. and Sinha R. N. (1962) Fungi associated with hot spots in farm stored grain. Can. J. PL Sci. 42, 130–141.CrossRefGoogle Scholar
  6. Wheatley P. E. (1973) Relative susceptibility of maize varieties to Sitophilus zeamais Motschulsky. Trop, stored Prod. Inform. 25, 16–18.Google Scholar

Copyright information

© ICIPE 1986

Authors and Affiliations

  • G. W. K. Mensah
    • 1
  1. 1.Faculty of AgricultureUniversity of Swaziland, Luyengo CampusSwaziland

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