Mycelial compatibility of Sclerotinia sclerotiorum strains of different areas

Mycelial compatibility of 47 strains of Sclerotinia sclerotiorum, a plant pathogenic fungus was investigated. Since fungal strains of the same mycelial compatibility group (MCG) are genetically uniform, or highly similar, the number of MCGs reflects the genetic variability within the species. Pairings were carried out on tomato agar, and scored compatible or incompatible depending on the reaction between the strains. Strains of the same origin often gave incompatible reactions (barrage zone between their colonies), confirming the existance of several MCGs at the some place. Same MCGs were found even at distant locations, reflecting that some of the genotypes are widespread in the country