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Varietal resistance of cowpea to cowpea aphid, Aphis craccivora Koch.

Published online by Cambridge University Press:  19 September 2011

A. K. Ansari ,
H. F. Van Emden  and
S. R. Singh
A. K. Ansari
Affiliation:
Department of Crop Science, University of Sokoto, Nigeria
H. F. Van Emden
Affiliation:
Department of Horticulture, University of Reading, RG6 2AU, UK
S. R. Singh
Affiliation:
Grain Legume Improvement Program, IITA, Ibadan, Nigeria
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Abstract

As part of an extensive and systematic programme to find genetic sources of resistance to Aphis craccivora, a major pest of cowpea, Vigna unguiculata, a total of 181 accessions from the germpiasm collection at the International Institute of Tropical Agriculture were screened in glasshouse tests using a simple visual damage scale. Twenty-four accessions showed considerably reduced damage. To confirm these results on IS selected accessions, aphid population growth over 10 days was recorded. Zero aphids were found on three accessions (310,408-P2 and 801); another six accessions had populations of less than 30, compared with 200–400 on susceptible varieties. The other accessions showed only partial antibiosis and/or tolerance.

Résumé

Résistance variétale de la dolique au puceron de la dolique, Aphis craccivora Koch. Dans le cadre d'un vaste et systématique programme visant à trouver des sources génétiques de resistance à Aphis craccivora, parasite majeur de la dolique, Vigna unguiculata, un total de 181 acquisitions provenant de la collection de plasmes germinatifs de 1'lnstitut International d' Agriculture Tropicale ont été criblées sous serre en utilisant une simple échelle visuelle des dommages causes. Vingt-quatre acquisitions ont montré une reduction considerable des dommages. Pour confirmer ces résultats sur 15 acquisitions sélectionnées, la croissance de la population de pucerons a été mesurée après dix jours. Zero pucerons ont été trouvés sur trois acquisitions, autres six acquisitions ont montrees populations inferieures à 30, comparées aux populations de 200–400 observées sur les variétés sensibles. Les autres acquisitions montrèrent seulement une antibiose partielle ou/et tolerance.

Keywords

Vigna unguiculataAphis craccivorascreening methodsantibiosisVigna unguiculataAphis craccivoraméthodologie de criblageantibiose
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 2 , April 1992 , pp. 199 - 203
Copyright
Copyright © ICIPE 1992

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References

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