Exploration of Sources of Genetic Resistance in Maize Genotypes Against Stem Borer (Chilopartellus (Swinhoe))

S. Neupane, S. Subedi
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Abstract

Fourteen different maize genotypes were screened for their relative resistance to maize stem borer Chilopartellus (Swinhoe) under glass house condition at National Maize Research Program, Rampur, Chitwan during two consecutive years 2018 and 2019. The design of the experiment was completely randomized design having 2 replications. The unit plot size was one row of one meter length with 50 cm row to row and 20 cm plant to plant spacing. Two second instar larva of C. partellus (Swinhoe) per plant were released two times, first at 8th leaves (vegetative) and second at 12th leaves (Before tasseling) stages. Insect damage parameters (IDPs) viz. dead heart percentage, damage % at vegetative and foliar stage, foliar injury rating (1-9) at vegetative and before tasseling stage, tunnel length (cm), exit hole number and yield per plot were recorded to study the germplasm susceptibility level. The result revealed that IDPs and yield varied significantly among the tested genotypes. Over the years, IDPs like dead heart percentage (5.17%), percent damage atpre-tasseling stage (10.6%), foliar injury level (2.25), tunnel length (10.15 cm) and exit holes (2.32) were found lower with high yield (2235 g/plot) in RML-95/ RML-96 followed by RML- 86/RML-96. Two pipeline maize hybrids RML-95/RML-96 and RML-86/RML- 96 with least damaged by maize stem borer in both years will be useful for maize stem borer resistance source. Bangladesh J. Agril. Res. 45(3): 293-301, September 2020
玉米基因型对茎螟虫遗传抗性来源的探索
在2018年和2019年连续两年,在Chitwan Rampur国家玉米研究计划的玻璃室内条件下,筛选了14种不同玉米基因型对玉米茎螟虫的相对抗性。试验设计为完全随机设计,2个重复。小区面积为每行1米,行间距50厘米,株间间距20厘米。在第8叶(营养期)和第12叶(未抽雄期),每株2只二龄幼虫放生2次。记录虫害参数(IDPs),即死心率、营养期和叶期的害率%、营养期和抽雄前叶面害等级(1 ~ 9)、隧道长度(cm)、出口孔数和亩产,研究种质敏感性水平。结果表明,不同基因型间IDPs和产量差异显著。各年际间,RML-95/ RML-96的死心率(5.17%)、抽雄前损伤率(10.6%)、叶面损伤程度(2.25%)、隧道长度(10.15 cm)和出口孔数(2.32)较低,产量最高(2235 g/块),其次是RML- 86/RML-96。两个管道玉米杂交种RML-95/RML-96和RML-86/RML- 96两年内受玉米茎螟虫危害最小,可作为玉米茎螟虫抗性资源。孟加拉国J. Agril。Res. 45(3): 293-301, 2020年9月
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