Pathogenicity of various isolates of Macrophomina phaseolina on mulberry (Morus spp.)

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.

Keywords:

• Root rot
• Macrophomina phaseolina
• leaf yield
• mulberry
• disease

Acknowledgement

The authors are thankful to the Director, Central Sericultural Research and Training Institute, Srirampura, Mysore for providing facilitates and encouragement.