ABSTRACT Sweet potato weevil (Cylas punticollis Boheman) is a serious pest throughout sub-Saharan Africa. A study to evaluate 51 sweet potato genotypes for their tolerance to the weevil was conducted in a controlled experiment of no-choice arena. Genotype Tainung was the most susceptible to C. puncticollis. Genotypes Obugi and 5 Nyandere were the most tolerant to C. puncticollis. Many of the genotypes that showed a high level of weevil tolerance had the highest numbers of larvae. The genotypes that showed the highest number of larvae were Kenspot 3, Obugi and 1-Ujili. Nine genotypes including Naspot 1, K117, Kenspot 5, 62 Odhiogo, Tainung, Fundukhusia, Alupe or, SPK 031 and Kenspot 1 had the highest percentage (>75%) of external root damage while genotypes Obugi, Mogesi Gikenja and 5 Nyandere had the least percentage (≤25%). There were positive correlations between root starch and emerged C. puncticollis (r = 0.46341; p ≤ 0.001), root sucrose and emerged C. puncticollis (r = 0.48424; p ≤ 0.001). However, strong negative correlations existed between dry matter and emerged C. puncticollis (r = −0.70881; p ≤ 0.001). The genotypes with a high level of weevil tolerance can be recommended for breeding programmes as parents in relation to weevil tolerance.

中文翻译：

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所选甘薯基因型对甘薯象鼻虫（Cylas puncticcollis Boheman）的耐受性评价

摘要 甘薯象鼻虫 (Cylas punticollis Boheman) 是撒哈拉以南非洲的一种严重害虫。一项评估 51 种甘薯基因型对象鼻虫耐受性的研究是在无选择领域的受控实验中进行的。基因型Tainung 对点状念珠菌最敏感。基因型 Obugi 和 5 Nyandere 对 C. puncticolis 最耐受。许多表现出高水平象鼻虫耐受性的基因型具有最高数量的幼虫。幼虫数量最多的基因型是 Kenspot 3、Obugi 和 1-Ujili。包括 Naspot 1、K117、Kenspot 5、62 Odhiogo、Tainung、Fundukhusia、Alupe 或 SPK 031 和 Kenspot 1 在内的九个基因型具有最高的外根损伤百分比（>75%），而基因型 Obugi、Mogesi Gikenja 和 5 Nyandere最小百分比 (≤25%)。根淀粉与出现小球藻（r = 0.46341；p ≤ 0.001）、根蔗糖与出现小球藻（r = 0.48424；p ≤ 0.001）呈正相关。然而，干物质与出现的点状念珠菌之间存在强烈的负相关（r = -0.70881；p ≤ 0.001）。可以推荐具有高水平象鼻虫耐受性的基因型作为与象鼻虫耐受性相关的亲本进行育种计划。