Détail de l'auteur
Documents disponibles écrits par cet auteur (2)
Ajouter le résultat dans votre panier Faire une suggestion Affiner la recherche Interroger des sources externes
article/chapitre/communication
S. Githiri ; K. Ampongnyarko ; E. Osir ; P. Kimani | 1996Inheritance of aphid resistance and allelic relationships among sources of resistance was studied in the parents, F-1, F-2, F-3, and backcross populations of cowpea crosses. Each 4-day old seedling was infested with five fourth-instar aphids. Se[...]
article/chapitre/communication
I. Annan ; K. Ampongnyarko ; W. Tingey ; G. Schaefers | 1997Field and greenhouse studies were conducted in 1990 and 1991, to assess the effects of fertilizer application on the bionomics and population dynamics of cowpea aphid, Alphis craccivora Koch, and on the growth and yield of cowpea, Vigna unguicul[...]
