The isolates of the pathogen significantly differed in their morphological characters. These produced cottony white with more fluffy to dull white and partially fluffy growth on PDA. The sclerotia were globose to irregular in shape and dark brown to black in colour with the size ranging from 70.0 x 58.1 μ to 168.8 x 130.0 μ. There was no correlation between the sclerotial size and virulence. But, the most virulent isolate (Mp8) produced the maximum sclerotial dry weight (1883 mg) as against the least (1046 mg) by Mp4. Cottony type mycelial growth and the sclerotial formations were negatively correlated.
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