Screening of Maize Germplasm for Resistance Against Stem Borer (Chilo partellus Swinhoe)
Maize stem borer, Chilo partellus Swinhoe, is one of the most important biotic (insect) stresses for maize production in Nepal. Host-plant resistance is the most important approach in developing effective integrated pest management (IPM) system against this pest. Resistance of eighteen maize genotypes, including both enzootic and exotic, was evaluated by natural infestation method, partially based on CIMMYT screening method. Response of maize plants to the insect was categorized into resistant, moderately resistant, moderately susceptible and susceptible on the basis of percentage of undamaged, slightly damaged, moderately damaged and highly damaged plants for a given genotype. No reduction in yield was observed from the undamaged and slightly damaged individuals, whereas reduced or no yield was estimated from the moderately to highly damaged plants. Resistance of the tested maize genotypes differed significantly and compared clearly. Genotype S97TLYGHAYB(3) , possessing 4.9％ of moderately to highly damaged plants, was termed to be the most resistant among the six genotypes from CIMMYT and Gaurab (hybrid), possessing 53.8％ of moderately to highly damaged plants, was found to be the most susceptible one among the two susceptible maize genotypes. Since stem borer infestation is very high during every summer at National Maize Research Program (NMRP), Rampur it is suggested to screen the genotypes under natural infestation condition, which is very simple and useful in areas where there is no artificial insect rearing facility and where stem borer infestation levels are high and predictable.
Maize stem borer Chilo partellus Insect resistance Natural infestation screening method Maize (Zea mays L.)
Prem N. Sharma Purushottam Gautam
Nepal Agricultural Research Council, National Maize Research Program, Rampur, Chitwan, Nepal
国际会议
第九届亚洲玉米大会(the Ninth Asian Regional Maize Workshop)
北京
英文
158-161
2005-09-05（万方平台首次上网日期，不代表论文的发表时间）