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Uredinia hypophyllous (on lower side of leaf), usually closely grouped or diffuse, in pale-yellowish spots, minute, usually less than 100 µm diameter, yellowish when dry;paraphyses incurved, hyaline or nearly so, one-septate near base, borne on basal cells with urediniospores, wall 3-5 µm thick on convex side, 1 µm on concave side;urediniospores ovoid, obovoid, or ellipsoid, 16-25 x 21-31 µm;wall 1.0-1.5 µm thick, hyaline or pale-yellowish, echinulate, pores obscure, but probably three, equatorial and located in angles. Telia hypophyllous, gregarious or scattered, round, pulvinate, 0.17-0.25 mm diameter, white, erumpent through stoma, with incurved, hyaline, thick-walled paraphyses at outer part;teliospores and paraphyses formed superficially at one apex of a single or usually a bundle of sporogenous hyphae;teliospores ovoid or ellipsoid, thin-walled, less than 1 µm thick, hyaline, usually slightly attenuated at apex or rounded at both ends, 26-41 x 11-16 µm, forming a cylindrical four-celled promycelium;pericel short, fragile, hyaline;paraphyses cylindrical, hyaline, strongly incurved, thick-walled, 33-51 x 8-9 µm. See Tai (1947) and Cummins (1950) for more detailed descriptions.

Related crop

  • Rosa

Related Farm Practice

  • Thinning
  • Attenuation
  • Groups
Has Cabi datasheet ID
107838
Oss tagged
x

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