Screening of Soybean (Glycine max L. Merril) Genotypes for Resistance against Major Insect-Pests

Abstract

A study was conducted in the experimental farm of SASRD, Nagaland University during Kharif 2017 in order to screen soybean genotypes for resistance against major insect pests using two replications. Forty one soybean genotypes along with five check varieties were arranged in RBD. The major insect pests observed at weekly intervals were leaf webber (Anarsia ephippias), aphid (Aphis glycines), leaf hopper (Bothrogonia indistincta), Pod bug (Riptortus pedestris) and blister beetle (Mylabris phalerata). The genotypes NRC 134 (4.20 no/mrl) and JS 20-17 (0.70 no/mrl) showed highest and lowest infestation by leaf webber. Highest infestation of aphid was found on PS 1613 (21.85no/3leaf) and lowest was found on AMS 100-39 (1.50 no/3leaf). In case of leaf hopper, the highest infestation was found on NRC 137 (4.75no/3leaf) and the lowest infestation was found on DSb 34 (1.08 no/3leaf). Genotypes namely NRC 137 (5.88 no/mrl) showed highest infestation and genotype JS 21-15 (1.23 no/mrl) showed lowest infestation by blister beetle. For pod bug, genotype CSB 10112 (5.90 no/mrl) showed highest infestation and NRC 128 (0.12 no/mrl) showed lowest infestation. The highest yield was reported by TS 53 (3155 kg/ha) and lowest was NRC 131 (488.88 kg/ha). Cluster analysis was used to group line based on five major soybean insect pests (leaf webber, aphid, leaf hopper, blister beetle and pod bug) infestation levels within the site and found that Cluster V (TS 53, SL 1123, SKF-SPS-11) was considered the resistant cluster with highest yield, where the best performing genotypes were included.