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Disease Note.

Reservoir Hosts of Schizothyrium pomi, Cause of Flyspeck of Apple, in North Carolina. T. B. Sutton, Department of Plant Pathology, North Carolina State University, Raleigh 27695. J. J. Bond, and C. M. Ocamb-Basu. Department of Biology, Appalachian State University, Boone, NC 28607; and Department of Plant Pathology, North Carolina State University, Raleigh 27695. Plant Dis. 72:801. Accepted for publication 6 May 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0801B.

Schizothyrium pomi (Mont. & Fr.) Arx (anamorph Zygophiala jamaicensis Mason), cause of flyspeck of apple, has been reported on 78 plant species (1). Because flyspeck is an important apple disease, we surveyed vegetation around 15 orchards for reservoir hosts. S. pomi was identified by the presence of pseudothecia; in most instances, identity was confirmed by isolation on V-8 juice agar. S. pomi was observed on 38 species; Rubus spp. were the most common. Hosts not previously reported were: Acer rubrum L., Aesculus octandra Marsh . Amelanchier arborea (Michx.) Fern. var. laevis (Wieg.) Ahles, Castanea dentata (Marsh.) Borkh., Celtis occidentalis L., Clematis virginiana L., Cornusj1orida L., Diospyros virginiana L., Ficus carica L., Halesia carolina L., Hamamelis virginiana L., Ilex ambigua (Michx.) Torr., Lespedeza bicolor Turcz., Leucothoe recurva (Buckl.) Gray, Morus alba L., Oxydendrum arboreum (L.) DC., Polygonum cuspidatum Sieb. & Zucc., Poncirus trifoliata (L.) Raf., Prunus serotina Ehrh., Quercus coccinea Muenchh., Q. imbricaria Michx., Q. rubra L., Sambucus canadensis L., Smilax glauca Walt., and Tillia heterophylla Vent.

Reference: (1) K. F. Baker et al. Phytopathology 67:580. 1977. Pseudomonas syringae, Causal Agent of a Leaf Spot on