Spatial Pattern Analysis and Sampling of Hypoxylon Canker in Naturally Occurring Clones of Populus tremuloides. S. P. Falk, Former Graduate Research Assistant, State University of New York, College of Environmental Science and Forestry, Syracuse 13210. D. H. Griffin, and P. D. Manion. Professors, Faculty of Environmental and Forest Biology, State University of New York, College of Environmental Science and Forestry, Syracuse 13210. Plant Dis. 73:31-33. Accepted for publication 10 July 1988. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0031.

Analysis of the spatial arrangement of trees with Hypoxylon mammatum stem canker in naturally occurring clones of Populus tremuloides determined that the degree of dispersion of diseased trees usually was not significantly different from random. Proximity of diseased trees does not always increase the chances of adjacent trees becoming infected. A random sample generally would be adequate for estimating the disease incidence in clones.