Cultural and morphological variability of macrophomina phaseolina (tassi) goid causing charcoal rot of jowar in solapur district of maharastra, india

Gavali Manaji Tanaji., Mane Sudarshan Ramesh., Kumbhar Vivekanand Ramchandra., Birajdar Ganesh Mallikarjun and Udhav Narba Bhale

In the present studies, eleven isolates of Macrophomina phaseolina incitant of charcoal rot of Sorghum bicolor L were obtained from different agro-ecological areas of solapur districts in Maharastra. It’s varied in their cultural characteristics & pathogenic behavior. On the basis of colony colour, isolates were divided into four groups i.e. blackish grey, grey, blackish in center periphery creamish and grayish white. Maximum feathery (++++) colony appearance was found in the isolates of Mp4, Mp5, Mp6 and Mp7. The individual average radial growth of 11isolates of M. phaseolina ranged from 79.11 to 90.00 mm in 7 days after incubation. North solapur (Mp3) isolates produced highest number of Sclerotia i.e 143.8 Sclerotia/9 mm disc and 40.4/microscopic field (10X) while Mohol (Mp2) isolates produced minimum number of Sclerotia (57.0 sclerotia / 9mm disc & 16.4 / microscopic 10X field). Mohal (Mp2) and Pandharpur (Mp9) isolates produced largest size of sclerotia (28.6-39.6µm and 30.6-38.5µm) whereas Akkalkot (Mp4) produced smallest size of sclerotia (15.2-16.6µm). On the basis of Sclerotia morphology, two groups of isolates were formed, the one with oblong shape having irregular edges & the other are being round with regular edges.

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