Selection of Maize Genotypes Resistant to Pink Stem Borer and Sugarcane Borer  

作　　者：Abraham Agwu Ngwuta Samson Oyewole Ajala Ignatius Ugwudlke Obi Ene-Obong Efiom Ene-Obong 

机构地区：[1]Department of Crop Science and Technology, School of Agriculture and Agricultural Technology, Federal University of Technology, Owerri 460001, Nigeria [2]Maize Improvement Programme, International Institute of Tropical Agriculture, Ibadan 200001, Nigeria [3]Department of Crop Science, Faculty of Agriculture, University of Nigeria, Nsukka 400001, Nigeria [4]Department of Crop Science, Faculty of Agriculture, Cross River State University of Technology, Calabar 540001, Nigeria

出　　处：《Journal of Agricultural Science and Technology(A)》2015年第3期174-182,共9页农业科学与技术（A）

摘　　要：Maize is an important economic crop grown in Nigeria. Its production is dramatically affect by the pink stem borer--Sesamia caIamistis （Hampson, Noctuidae） and sugarcane borer--Eldana saccharina （Walker, Pyralidae） that are endemic in Southeastern Nigeria. In areas of stress, existing genotypes may marginally do well due to their inherent capabilities. Therefore, it is possible to find useful genes in such areas of stress, since such genes have been responsible for the survival of host crops over the years. Evaluation study was conducted for a range of agronomic characteristics and resistance attributes for 209 local maize collections from Southeastern Nigeria along with three improved check varieties. Field trials were conducted at three locations in a total of four environments in 2001. Highly significant genotypic variances as were noted in all the traits, are indicative of the magnitude of variation that exists among the genotypes, thus providing the opportunity of selection for desirable traits. Furthermore, four traits, namely, leaf feeding, ear damage, stalk lodging and yield were used from across the environments to construct a rank summation index （RSI）, which was used to rank the entries for resistance to stem borers. This RSI led to the identification of 11 genotypes which represents the best 5% of the 212 genotypes in resistance ability. Genotype AMA TZBR-WC1 （from International Institute of Tropical Agriculture （IITA）, Ibadan） had the best overall resistance levels, followed by genotypes SE NG-77 and SE NG-67 （from Umuahia North）, SE NG-62 （from Ikwuano）, SE NG-148 （from Ukwa West）, SE NG-106 （from Bende）, SE NG-119 （from Isiala Ngwa）, SE NG-33 （from Ikwuano） and SE NG-65 （from Umuahia North）.

关 键 词：Zea mays Sesamia calamistis Eldana saccharina genetic variance rank selection index stem borer resistance. 

分 类 号：S513[农业科学—作物学] S435.661