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Field Evaluation of Yield and Resistances of Local and Improved Sweet Potato (Ipomoea batatas (L) Lam) Accessions to Cylas puncticollis and Meloidogyne incognita in Southeastern Nigeria
並列摘要
Aim of the study was to evaluate local and improved accessions of sweet potato for resistances to Cylas puncticollis and Meloidogyne incognita and identify suitable ones for incorporation in breeding programmes for the production of genetically resistant and high yielding varieties. The experiment was conducted at the University of Uyo, Teaching and Research Farm located at Use Offot-Uyo, Southeastern Nigeria and laid out in a randomized complete block design, with three replications. Eighteen sweet potato accessions were studied, comprising 13 local accessions, namely: E_5, B_6, E_3, B_(26), B_2, E_(11), E_6, E_(17), B_(21), E_(14), E_7, B_(23), E_(10) and five IITA improved and recommended varieties (TIS 87/0087, TIS 8441, TIS 8164, TIS 2532 and TIS 86/0356) for southeastern Nigeria. Three of the IITA improved and recommended varieties (TIS 86/0356, TIS 8164 and TIS 87/0087 had higher number of root tubers per plot and higher root tuber yield per hectare than the local accessions, while eight of the local accessions indicated high resistances to Cylas puncticollis, namely: B_6, B_2, E_(17), B_(21), E_(14), E_7, B_(23) and E_(10) and Meloidogyne incognita, namely: B_6, E_3, B_(26), B_(21), E_(14), E_7, B_(23) and E_(10). The local accessions with high root tuber yields and very high resistances to C. puncticollis and M. incognita (B_6, B_(21) and E_(10)) could be incorporated in breeding programmes involving TIS 87/0087, TIS 8164, TIS 2532 and TIS 86/0356 for the production of hybrid varieties with higher yields and resistances to the pests in southeastern Nigeria.