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Varietal Resistance of Cowpea to Cowpea Aphid, Aphis Craccivora Koch.

  • A. K. Ansari
  • H. F. Van Emden
  • S. R. Singh
Research Article

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.

Key Words

Vigna unguiculata Aphis craccivora screening methods antibiosis 

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 résistance à Aphis craccivora, parasite majeur de la dolique, Vigna unguiculata, un total de 181 acquisitions provenant de la collection de plasmes germinatifs de l’Institut International d’Agriculture Tropicale ont été criblées sous serre en utilisant une simple échelle visuelle des dommages causés. Vingt-quatre acquisitions ont montré une réduction considérable des dommages. Pour confirmer ces résultats sur 15 acquisitions sélectionnées, la croissance de la population de pucerons a été mesurée après dix jours. Zéro pucerons ont été trouvés sur trois acquisitions, autres six acquisitions ont montrées populations inférieures à 30, comparées aux populations de 200–400 observées sur les variétés sensibles. Les autres acquisitions montrèrent seulement une antibiose partielle ou/et tolérance.

Mots Clés

Vigna unguiculata Aphis craccivora méthodologie de criblage antibiose 

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Copyright information

© ICIPE 1992

Authors and Affiliations

  • A. K. Ansari
    • 1
  • H. F. Van Emden
    • 2
  • S. R. Singh
    • 3
  1. 1.Department of Crop ScienceUniversity of SokotoNigeria
  2. 2.Department of HorticultureUniversity of ReadingUK
  3. 3.Grain Legume Improvement ProgramIITAIbadanNigeria

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