Pathogenicity of various isolates ofMacrophomina phaseolinaon mulberry (Morusspp.)

Abstract

Various isolates of Macrophomina phaseolina were isolated from root rot disease affected mulberry gardens in south India. Pathogenicity trials exhibited that the different isolates (AP-01 to AP-09, KA-01 to KA-09 and TN-01 to TN-09) were found pathogenic to mulberry causing root rot disease. The results revealed that the sprouting percentage was significantly decreased (21.39 -44.28%), while root rot disease severity was found to be markedly increased (71.0 -100%). Thus the different isolates viz., AP-01 to AP-09, KA-01 to KA-09 and TN-01 to TN-09 fulfilled the Koch postulates. However, it was evident that the isolates (AP-01 to AP-09, KA-01 to KA-09 and TN-01 to TN-09) have exhibited variation in their virulency and the isolate AP-03 was found to be most virulent.

Survey, Virulence and Pathogenicity of Root Rot Incidence of Cowpea in Selected Districts of Tamilnadu caused by Macrophomina phaseolina (Tassi.) Goid

“…Generally, variability in the pathogenicity among the isolates of M. phaseolina was reported by earlier workers (Su et al, 2001;Chowdary, 2009;Rayatpanah and Dalili, 2012). The above reports are in agreement with the present investigation.Besides an increase in the root rot incidence was observed with an increase in the age of the crop.…”