Vegetative Compatibility Groups inLeucocytospora kunzei

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Abstract
Vegetative compatability groups (v-c groups) in Leucocytospora kunzei were demonstrated by pairing isolates on potato-dextrose agar and observing the reaction along the line of contact of the expanding colonies. By this method, 487 isolates of L. kunzei, from 196 cankers on 121 trees, were examined. The isolates were obtained primarily from infected Picea spp. located in urban sites in Michigan and in one forest site in Colorado [USA]. Thirty-six single v-c groups and eight multi-merge groups in L. kunzei were identified. In 152 of 154 cases, multiple isolates recovered from a given canker were in the same v-c group. Within a tree or among closely spaced trees, a single or a few v-c groups predominated. Some v-c groups contained isolates from different species of Picea or from distant sites. Vegetative compatibility groups do not segregate during conidiogenesis in L. kunzei.