98 BULLETIN. 1366, U. S. DEPARTMENT OF AGRICULTURE 



SOLANUM— Continued. 



S. tuberosum, potato — Continued. 



Rhizoctonia crocorum (Pers.) DC, violet root-rot. N. Y., Nebr., Wash., 



Oreg. 

 Rhizopus nigricans Ehr., leak. Ohio, Idaho, Wash., Calif. 

 Sclerotinia sclerotiorum (Lib.) Mass., stem-rot. N. Y., Fla. 

 Sclerotium rolfsii Sacc., stem-rot. South Atlantic and Gulf Coast States. 

 Spondylocladium atrovirens C. O. Harz, silver scurf. General. 

 Spongospora subterranea- (Wallr.) T. Johnson, powdery scab. 



N. Y., Pa., S. C., Fla., Minn., Wyo., Wash., Oreg. 

 Synchytrium endobioticum (Schilb.) Perc, wart. Pa., Md., W. Va. 

 Verticillium alboatrum Reinke and Berth., wilt. New England, N. Y., Pa., 



Ohio, Wis., N. Dak., Colo., Utah, Idaho, Pacific coast. 

 Black-heart, nonpar. Frequent, especially as a result of overheating in 



transit. 

 Curly-dwarf, undet. Frequent. 



Hollow-heart, nonpar. Frequently reported, especially in overgrown tubers. 

 Hopperburn, undet. East of Great Plains. 

 Internal brown-spot, nonpar. Frequent. 

 Leaf-roll, undet. General. 

 Leak, various causes. General (see also Pythium debaryanum and Rhizopus 



nigricans) . 

 Malnutrition, nonpar. New England, Middle Atlantic States, Minn., 



Wash. 

 Mosaic, undet. General. 

 Net-necrosis, undet. Frequent. 

 Russet dwarf, undet. Idaho. 



Spindle-tuber, undet. Vt., N. Y., N. J., S. Dak., Nebr., Ky. 

 Streak, undet. Atlantic Coast States, Mich., Minn., Idaho, Wash., Calif. 

 Tipburn, nonpar. General. 



Witches'-broom, undet. Me., Mich., Minn.; Pacific Northwest. 

 Yellow dwarf, undet. Vt., N. Y., N. J., Pa., Fla., S. Dak. 



S0PH03A. 



S. japonica, *pagoda tree. 



Microsphaera alni (Wallr.) Wint., powdery mildew. Conn. 

 Ozonium omnivorum Shear (Phymatotrichum o?nnivorum (Shear) Dug.), 

 root-rot. Tex. 



SORBUS. 



Sorbus sp., mountain-ash. 



Bacillus amylovorus (Burr.) Trev. (Erwinia amylovora (Burr.) Com. S. A. B.), 



blight. Mich., Minn. 

 Cytospora chrysosperma (Pers.) Fr., canker. Mont. 

 Gymnosporangium blasdaleanum (Diet, and Holw.) Kern, rust. Oreg. 

 G. cornutum (Pers.) Arth., rust. New England, N. Y., Mich., Wis., Mont., 



Wyo., Colo. 

 G. globosum Farl., rust. New England, N. Y. 



G. juniperinum (L.) C. Martius, rust. Mont., W}*o., Colo., Wash. 

 G. nootkatensis (Trel.) Arth., rust. Wash., Alaska. 

 Nummularia discreta (Schw.) Tul., blister canker. Mass., Pa. 

 Phyllosticta sorbi West., leaf -spot. Mo. 



Physalospora malorum (Pk.) Shear (P. cydoniae Am. Auct.), black-rot. 

 Polystictus hirsutus Fr., white sap-rot. 

 Valsa leucostoma (Pers.) Fr., die-back. Mont. 

 Venturia inaequalis (Cke.) Aderh., scab. Minn. 



SPINACIA. 



S. oleracea, spinach. 



Cercospora beticola Sacc, leaf-spot. Mass., Tex. 



C. dubia (H. Riess) Wint., leaf -spot. Mo. 



C. flag ellifor mis Ell. and Hals., leaf-spot. N. J., Del., Ga., Ind., Minn. 



Clad.osporium macrocarpum Preuss, scab, black-mold. Pa., Del., Tex. 



Colletotrichum spinaciae Ell. and Hals., anthracnose. Conn., N. Y., N. J., 



Va., La., Tex. 

 Corticium vagum Berk, and Curt., stem-rot. Pa., 111., Wash. 

 Entyloma ellisii Hals., smut. N. J. 



