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Screening of Soybean (Glycine max (L.) Merr.) Genotypes for Resistance to Rhizoctonia Aerial Blight Caused by Rhizoctonia solani under Nagaland Conditions

Lhiwe-Ü Chiero, Narola Pongener, Moirangthem Indira Devi, Waluniba —, Pezangulie Chakruno

Published 9/17/2026

PDF1.4 MB

Abstract

Soybean (Glycine max (L.) Merr.) is an important crop worldwide, but its productivity is constrained by Rhizoctonia aerial blight caused by Rhizoctonia solani. The present study evaluated 54 soybean genotypes, including three check varieties, for resistance to Rhizoctonia aerial blight under natural field conditions. None of the genotypes showed an immune response; however, genotypes exhibited resistant, moderately resistant, and moderately susceptible reactions. The mean per cent disease index (PDI) ranged from 1.66% to 28.96%, with the lowest PDI recorded in AMS 24-7 (1.66%) and the highest in SL 1442 (28.96%). Similarly, the area under the disease progress curve (AUDPC) was lowest in AMS 24-7 (20.81) and highest in SL 1442 (237.43). Disease severity showed a negative and highly significant correlation with minimum temperature and maximum relative humidity. These findings identify promising genotypes for resistance breeding.

Keywords

Area under the disease progress curve (AUDPC)Rhizoctonia solanidisease severityRhizoctonia aerial blightsoybean

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