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.