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Varietal differences in the susceptibility of cowpea to larvae of the seed moth, Cydia ptychora (Meyrick) (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  10 July 2009

R. M. Perrin
R. M. Perrin
Affiliation:
Imperial College Field Station, Silwood Park, Ascot, Berkshire SL5 7PY, UK.
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Abstract

Glasshouse and field screening showed that several varieties of cowpea (Vigna unguiculata) in the germplasm collection at the International Institute of Tropical Agriculture at Ibadan, Nigeria, had promising levels of resistance to damage by larvae of Cydia ptychora (Meyr.). There was no preference between varieties for oviposition in the glasshouse, but varietal differences in damage to pods and seeds occurred due to differences in the pod-boring and seed-feeding success of larvae. Large numbers of seeds per pod in some varieties diluted the effects of a given larval density and resulted in low percentages of damaged seed. A measure of relative susceptibility was devised that overcame the problem of chance escape from attack by certain pods. Resistance in glasshouse screening was not necessarily related to resistance in the field, where plant growth habits and the ecological requirements of the adult moths are more fully expressed and play an important role in determining the outcome of the plant-insect interaction. The most resistant variety in the glasshouse, Vita-3, was least resistant in the field, partly because it was partially photosensitive and produced few flowers and pods in the early growing season in Ibadan. Two varieties, TVu 946 and TVu 2994, may have escaped severe attack by maturing quickly. The former is small-leaved, non-vigorous, carries its pods on long peduncles well above the foliage and consequently constitutes an unsuitable habitat for daytime sheltering by adults. It was the least damaged variety in the field trial. The latter was most attacked by other pod-feeding pests, and the consequent reduction in seed weight and quality appeared to enhance the level of damage caused by C. ptychora.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 68 , Issue 1 , April 1978 , pp. 47 - 56
Copyright
Copyright © Cambridge University Press 1978

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References

Allard, R. W. (1960). Principles of plant breeding.—485 pp. New York, Wiley.Google Scholar
Iita (1974). 1973 report. Grain legume improvement program.—78 pp. Ibadan, International Institute of Tropical Agriculture.Google Scholar
Iita (1975). Annual report 1974.—199 pp. Ibadan, International Institute of Tropical Agriculture.Google Scholar
Lawani, S. M. & Rachie, K. O. (1975). Announcing pulse cultivars and germplasms for the hulotrops.—Trop. Grain Legume Bull, no. 1, p. 12.Google Scholar
Lawrence, W. J. C. (1968). Plant breeding.—64 pp. London, Arnold.Google Scholar
Pathak, M. D. (1970). Genetics of plants in pest management, pp. 138–157 in Rabb, R. L. & Guthrie, F. E. (Eds.). Concepts of pest management.—242 pp. Raleigh, North Carolina State University.Google Scholar
Perrin, R. M. (1976). Host plant relationships of the cowpea pod borer, Cydia ptychora (Meyr.).—Trop. Grain Legume Bull.. no. 5, p. 10.Google Scholar
Perrin, R. M. (1977). Studies on host plant selection by the cowpea seed moth, Cydia ptychora.—Ann. appl. Biol. 87, 175–182.Google Scholar
Perrin, R. M. (1978). The effect of some cowpea varieties on the development and survival of larvae of the seed moth, Cydia ptychora (Meyrick) (Lepidoptera, Tortricidae).— Bull. ent. Res. 68, 57–63.Google Scholar
Rawal, K. (1975). Cowpea breeding at IITA—an overview, pp. 6–10 in Luse, R. A. & Rachie, K. O. (Eds.). Proceedings of IITA collaborators' meeting on grain legume improvement, 9–13 06, 1975, Ibadan.— Ibadan, International Institute of Tropical Agriculture.Google Scholar
Singh, S. R. & Taylor, T. A. (in press). The potential for the development of integrated pest management systems in cowpeas. Proceedings of the 1st international symposium on pests of grain legumes. IITA, Ibadan, 1976.Google Scholar
Singh, S. R., Williams, R. J., Rachie, K. O., Rawal, K., Nangju, D., Wien, H. C. & Luse, R. A. (1975). Vita-3 cowpea (GP-3).—Trop. Grain Legume Bull. no. 1, 18–19.Google Scholar
Stenmark, A. (1974). Studies on the pea moth (Laspeyresia nigricana Steph.) in central Sweden.—Meddn St. VartskAnst. 15, 451–475.Google Scholar
Taylor, T. A. (1965). Observations on the bionomics of Laspeyresia ptychora Meyr. (Lepidoptera, Eucosmidae) infesting cowpea in Nigeria.—Bull. ent. Res. 55, 761–773.CrossRefGoogle Scholar
Taylor, T. A. (1969). Preliminary studies on the integrated control of the pest complex on cowpea, Vigna unguiculata Walp., in Nigeria.—J. econ. Ent. 62, 900–902.Google Scholar
Wright, D. W., Geering, Q. A. & Dunn, J. A. (1951). Varietal differences in the susceptibility of peas to attack by the pea moth, Laspeyresia nigricana (Steph.)—Bull. ent. Res. 41, 663–677.Google Scholar