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Disease Note.

Smut of Speedwell Caused by Schroeteria delastrina in Arkansas. D. K. Heiny, Department of Plant Pathology, University of Arkansas, Fayetteville 72701. L. H. Riley, and G. E. Templeton. Department of Plant Pathology, University of Arkansas, Fayetteville 72701. Plant Dis. 72:175. Accepted for publication 12 October 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0175A.

Schroeteria delastrina (Tul.) Winter was collected on corn speedwell (Veronica arvensis L.), a lawn weed, at three locations in Fayetteville, Arkansas, during April and May 1987. The smut destroyed seeds and filled the seed capsules with spores. Light olivaceous-brown spores, usually in pairs, with coarsely ribbed walls measured 7-11 µm in diameter and closely resembled those photographed by Viinky (2). Spores germinated in 1 day at 21 C on water agar. After 2-3 wk, short, flask-shaped or elongate, septate promycelia and spherical sporidia in chains formed as originally described by Brefeld (1883). Our literature search indicates only two other reports of Schroeteria in North America, including samples on speedwell from British Columbia and Ontario in Canada and from Whitman County, Washington, in the United States (1). Specimens have been deposited in the National Fungus Collection (BPI) (USO 196394) at Beltsville, Maryland, and the herbarium of Washington State University (WSP 68203) in Pullman.

References: (1) R. Duran. Can. 1. Bot. 50:2569, 1972. (2) K. Vilnky. Syrnb. Bot. Ups. 24:2, 1985.