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Disease Note.

Perithecia of Sphaerotheca fuliginea on Cucurbits in North Carolina. L. F. Grand, Department of Plant Pathology and School of Forest Resources, North Carolina State University, Raleigh 27695-7616. Plant Dis. 71:761. Accepted for publication 14 May 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0761B.

Pcrithccin of Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll. have been reported only twice on cucurbits in North America - on Cucurbita pepo L. var. melopepo Alef. 'Zucchini Dark Green' and 'Ambassador' in California (2) and on Cucumis sativus L. 'Harliton Seedless, "Burpee Hybrid: 'Highmark II: and 'Marketmore' in glasshouses in Ontario, Canada (1), In September. October. and November 1986. perithecia of S. fulginea were found on C. pepo 'Zucchini' in Richmond County and on Cucumis melo L. 'Ambrosia'; Cucurbita maxima Duchn. 'Show King, "Big Max.'and 'Waltham Butter'; C. pepo 'Vegetable Spaghetti'; and Lagearla siceraria (Mol.) StandI. 'Birdhouse,"Clemson's Club,' 'Dipper,' and 'Hercules Club' in a field in Henderson County. Perithecia averaged 96µm in diamete rand contained one ascus. 49x 68 µm. Only immature ascospores were observed. Hyphoid appendages were septate and brown near the base, fading to hyaline. Perithecia on all plants were associated with conidia containing fibrosin bodies (in 3% K0H) typical of S. fuliginea.

References: (1) W. R. Jarvis and K. Slingsby. Planl Dis. 68:S36, 1984. (2) D. G. Kontaxis. Plant Dis. Rep. 63:278, 1979.