Varietal resistance of cowpeas to the cowpea aphid,Aphis craccivorakoch (Homoptera: Aphididae) under field and screenhouse conditions in Nigeria
- 1 January 1988
- journal article
- research article
- Published by Taylor & Francis in Tropical Pest Management
- Vol. 34 (4) , 445-447
- https://doi.org/10.1080/09670878809371299
Abstract
Twenty four varieties of cowpea were evaluated for field resistance to Aphis craccivora Koch under natural infestation at Ile‐lfe, Nigeria. The varieties EW/1, TVu 1037, TVu 2896, TVu 2994 and TVu 3000 showed the lowest field infestation. This may be explained by antixenosis with respect to varietal selection or feeding and antibiosis. Screenhouse studies showed that the mechanism of resistance in TVu 1037, TVu 2896 and TVu 3000 includes antibiosis, manifested as high mortality of nymphs, reduced lifespan and low fecundity of adults.Keywords
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