Screening of Maize Genotypes against Southern Corn Leaf Blight (Bipolaris maydis) under Artificial Epiphytotic Conditions
Screening of Maize Genotypes against Southern Corn Leaf Blight (Bipolaris maydis) under Artificial Epiphytotic Conditions
Azra1* and Shaukat Hussain2
ABSTRACT
Thirty-six maize genotypes were evaluated under artificial epiphytotic of southern corn leaf blight during Kharif season 2015 and 2016 to find out new sources of genetic resistance in maize genotypes against southern corn leaf blight. The experiment was laid out as randomized complete block design with three replications. Data on disease severity and grain yield were recorded. There were not significant differences in disease severity among maize genotypes for individual years. However, significant differences were recorded amongst the genotypes when the data were pooled over two years. Based on disease severity scale 14 genotypes were categorized as moderately resistant, 14 moderately susceptible and the remaining eight genotypes were grouped as highly susceptible. Significant differences were recorded for grain yield among all tested genotypes during kharif season 2015 and 2016 as well as data pooled over two years. Moderately resistant genotypes CS-2Y10, EVY-1 and EHY-2 scored highest yield. Conversely, the lowest yield was observed for the highly susceptible genotypes WL-4 and WL-5. Agglomerative hierarchical cluster analysis with grain yield and disease severity categorized the tested genotypes into two major clusters. Cluster 1 is further divided into three sub clusters. In sub cluster I most of the genotypes are moderately resistant with medium to high yielding potential. Sub cluster II includes highly susceptible genotypes with low yield potential. Sub cluster III has moderately susceptible to moderately resistant genotypes. However, genotypes of this sub cluster are high yielding. Genotype CS-2Y10, being moderately resistant, is also the highest yielding genotype.Cluster II includes moderate to highly susceptible genotypes. All genotypes in this cluster are however low yielding.
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December 2019
Vol. 35, Iss. 4, Pages 1020-1356
