Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 314 DISEASES OF CULTIVATED PLANTS the pustules are pale orange, and irregularly scattered. Later in the season small black clusters of teleutospores appear on the under surface of the leaves. Aecidiospores orange, aculeolate, 20-28 yu, diam., paraphyses clavate, orange. Uredospores orange, aculeate, 16-22 fi. Teleutospores oblong, apiculate, warted, 5-10 septate, black and opaque, 90-140 X 20-35 /x, pedicel thickened below. -r- Fig. g-i.—Phramidium riibi-idafi. i, pustules an
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 314 DISEASES OF CULTIVATED PLANTS the pustules are pale orange, and irregularly scattered. Later in the season small black clusters of teleutospores appear on the under surface of the leaves. Aecidiospores orange, aculeolate, 20-28 yu, diam., paraphyses clavate, orange. Uredospores orange, aculeate, 16-22 fi. Teleutospores oblong, apiculate, warted, 5-10 septate, black and opaque, 90-140 X 20-35 /x, pedicel thickened below. -r- Fig. g-i.—Phramidium riibi-idafi. i, pustules and teleuto- spores on under surface of raspberry leaf; 2, tcleutospore; .. 1 :.i:—. - chains of warted spores ; 3, section through an accidiuni b, paraphyses ; 4, uredospores. highly mag. Fig. I nat. size, remainder Spraying with potassium sulphide arrests the spread of the disease, li Bordeaux mixture is used it must be diluted, or the foliage will be scorched. Diseased leaves that have fallen should be swept up and burned. XENODOCHUS (Schlecht.) Teleutospores pedicellate, many-celled, cylindrical, brown, forming large blackish spore-clusters. Aecidiospores in
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