| Popis: |
Three sites differing in soil type, vegetation and weevil pressure, were used to evaluate the field performance of 18 improved sweet potato clones and two local cultivars, and their reaction to weevils (Cylas spp.) in Cameroon. Higher yields were obtained in the wet season than in the dry season. The highest yields were obtained in Nyombe in both wet and dry seasons; yields were halved in each of the other sites. Clones suffered more weevil damage in the dry season than in the wet season. Clones Tib 1, 1611, and 502 were very tolerant to weevils, whereas the high yielding clones 1112 and 1639 were very susceptible. Root yield was not correlated with root weevil damage, and yield potential and yield stability were found to be unrelated. Stability methods differed in identifying stable clones, and the rankings of clones varied with the trait measured. However, both Eberhart-Russell and Shukla stability methods rated clones 048, Tib 1, 1602, 1639, 002 and Njombe as stable for root yields. Also, there was no ... |
