Pre and post emergence mortality in soybean seedling by Macrophomina phaseolina isolates

Abstract

Charcoal rot of soybean incited by Macrophomina phaseolina (Tassi) Goid [=Rhizoctonia bataticola (Taub.) Butler] is a serious disease causes considerable yield loss across the world. Present investigation was undertaken to determine the pathogenic potential of sixteen isolates isolated from charcoal rot affected samples of different districts of Madhya Pradesh, India. Three varieties i.e. JS 93-05, JS 20-29 and JS 95-60 were tested against each isolate by sick pot method. All sixteen isolates were found to be pathogenic and recorded pre and post emergence mortality significantly. Maximum pre-emergence (37.78%) and post emergence (20.63%) mortality was recorded from the isolate of Chhindwara (Mp-4(CWA)). Significant highest mean percentage of pre-emergence (32.35%) and post emergence mortality (18.99%) was observed in JS 20-29 and JS 95-60, respectively. Based upon the average data of pre and post emergence mortality in three varieties (table 3), isolates from Chhindwara (Mp-4(CWA)), Jabalpur (Mp-1(JBP)), Hoshangabad (Mp-6(HBD)) and Seoni (Mp-3(SEO)) were found to be highly virulent(>25% mortality). Whereas, isolates from Umariya (Mp-12(UMR)), Rajgarh (Mp-15(RJG)) and Raisen (Mp-10(RSN)) were least virulent (Up to 20% mortality).