A Canker Disease of the Cupressaceae in Kansas and Texas Caused by Seiridium unicorne. N. A. Tisserat, Associate Professor, Department of Plant Pathology, Throckmorton Hall, Kansas State University, Manhattan 66506-5502. A. Nus, and L. W. Barnes. Research Assistant, Department of Plant Pathology, Throckmorton Hall, Kansas State University, Manhattan 66506-5502, and Extension Plant Pathologist, Department of Plant Pathology, Texas A&M University, College Station 77843. Plant Dis. 75:138-140. Accepted for publication 5 July 1990. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0138.

Seiridium unicorne caused cankers on Oriental arborvitae (Thuja orientalis) and eastern red cedar (Juniperus virginiana) in Kansas and Texas and on Italian cypress (Cupressus sempervirens), Arizona cypress (C. arizonica), and Leyland cypress (Cupressocyparis leylandii) in Texas. The fungus also was associated with small, annual cankers on bald-cypress (Taxodium distichum) in Kansas landscape plantings. Cankers on Rocky Mountain (J. scopulorum) and Chinese (J. chinensis) junipers and on northern white-cedar (T. occidentalis) developed 1 mo after inoculation in greenhouse or field studies. No evidence of host specificity in fungal isolates was found.