Leaf and Shoot Blight of Aspen Caused by Venturia macularis in Northern Minnesota. Neil A. Anderson, Professor, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108. Ralph L. Anderson, Plant Pathologist (retired), North Central Forest Experiment Station, USDA, Forest Service, St. Paul, MN 55108. Plant Dis. 64:558-559. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1980. DOI: 10.1094/PD-64-558.

Venturia macularis caused leaf and shoot blight of aspen (Populus rremuloides). The disease became epidemic on 3-yr-old sprouts and decreased height growth 8–10 cm (3–4 in.) annually and deformed the trees. The aspen ramets put out secondary shoots in 1973 when 80% of the initial shoot growth was infected. Secondary shoot growth did not occur in 1974 and 1975 when 49 and 44% of the new growth, respectively, had leaf and shoot blight. The disease was controlled by applications of benomyl.