Hostname: page-component-848d4c4894-75dct Total loading time: 0 Render date: 2024-05-30T11:06:28.483Z Has data issue: false hasContentIssue false

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

Abstract

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.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Ansari, A. K. (1984). Biology of Aphis craccivora (Koch) and varietal resistance of cowpeas.—273 pp. Ph.D. thesis, Univ. Reading.Google Scholar
Guss, P. L. & Branson, T. F. (1972). The use of 75Se in feeding studies with the corn leaf aphid (Hemiptera (Homoptera) Aphididae).—Ann. ent. Soc. Am.. 65, 303306.CrossRefGoogle Scholar
Guthrie, F. E., Campbell, W. V. & Baron, R. L. (1962). Feeding sites of the green peach aphid with respect to its adaptation to tobacco.—Ann. ent. Soc. Am. 55, 4246.CrossRefGoogle Scholar
Harvey, T. L. & Hackerott, H. L. (1958). Spotted alfalfa aphid reaction and injury to resistant and susceptible alfalfa clones reciprocally grafted.—J. econ. Ent. 51, 760762.CrossRefGoogle Scholar
Howe, W. L. & Pesho, G. R. (1960). Influence of plant age on the survival of alfalfa varieties differing in resistance to the spotted alfalfa aphid.—J. econ. Ent. 53, 142144.CrossRefGoogle Scholar
Roach, W. A. (1937). Studies on possible causes of immunity.—Ann. appl. Biol. 24, 206210.Google Scholar
Thurston, R., Smith, W. T. & Cooper, B. P. (1966). Alkaloid secretion by trichomes of Nicotiana species and resistance to aphids.—Entomologia exp. appl.. 9, 428432.CrossRefGoogle Scholar
Thurston, R. & Webster, J. A. (1962). Toxicity of Nicotiana gossei Domin. to Myzus persicae (Sulzer).—Entomologia exp. appl.. 5, 233238.CrossRefGoogle Scholar
Umeya, K. & Imai, E. (1965). Growth of the azuki bean weevil (Callosobruchus chinesis L.) and the Mexican bean weevil (Zabrotes subfasciatus Boh.) on beans of grafted Phaseolus plants.—Jap. J. appl. Ent. Zool.. 9, 239246.CrossRefGoogle Scholar