Screening of Sesamum (Sesamum indicum L.) Genotypes Against Powdery Mildew Disease

Abstract

An investigation was conducted to screen twentyseven genotypes to identify the source of resistance to powdery mildew disease. All the twenty seven genotypes were raised during summer 2024 at RARS, Jagtial under unprotected field conditions, following infector row technique with Swetha as susceptible check. After 50-60 DAS,the genotypes were scored for powdery mildew using 0-9 scale.  Among the genotypes screened,seven genotypes viz., BRT-04, JCS 2454 × BRT-04, JCS 1020 × BRT-04, Rajeshwari × JCS 1020, JCS 1020 × ES-139-2-84, Rajeshwari × ES-139-2-84, Swetha × ES-139-2-84 were found resistant with PDI score ranging from 1-30 %. Seventeen genotypes were found moderately resistant with PDI ranging from 30%-50% and two genotypes viz., Rajeshwari and JCS DT 26 exhibited PDI score between 50-100% was found to be susceptible. None of the genotypes were found to be immune in response.The identified resistant genotypes can be further utilized for development of resistant varieties and also aids in identification of marker through molecular breeding.