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Graft-transmissibility of resistance to cowpea aphid, Aphis craccivora Koch (Hemiptera: Aphididae), in six highly antibiotic cowpea varieties

Published online by Cambridge University Press:  10 July 2009

A. K. Ansari
Department of Horticulture, The University, Reading, RG6 2AU, UK
H. F. van Emden
Department of Horticulture, The University, Reading, RG6 2AU, UK
S. R. Singh
International Institute of Tropical Agriculture, Ibadan, Nigeria


The use of six cowpea varieties highly resistant to Aphis craccivora Koch in grafts (as resistant scion and rootstock) with the susceptible variety Prima indicated the presence of a graft-transmissible chemical involved in the resistance. Wrapping the resistant part in light-proof foil indicated that photosynthesis is involved in the production of the chemical. In a third test, intergrafting is involved in the production of the chemical. In a third test, intergrafting the resistant part with and without leaves confirmed the importance of photosynthesis in the transfer of resistance. Finally, covering the resistance intergrafts with foil showed that the accumulation of the chemical in the stem before the foil was applied was the major source of the graft-transmissible resistance.

Original Articles
Copyright © Cambridge University Press 1989

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