Conversion to Curative Morphology inEndothia Parasiticaand its Restriction by Vegetative Compatibility

Endothia parasitica strains in some vegetative compatibility (v-c) groups barrage weakly when their mycelia meet on agar media. The morphology associated with Italian white curative (hypovirulent) strains of this fungus was used as a marker to detect cytoplasmic transfer between weakly-barraging strains. The (cytoplasmic) determinants for curative morphology were rapidly transferred between most weakly-barraging strains, but transferred infrequently or not at all between strongly-barraging strains.