

LIST OF DISEASES OF ECONOMIC PLANTS 107 



VIOLA — Continued. , 



Y. tricolor and V. cornuta, pansy. 



Alternaria violae Gall, and P. H. Dorsett, leaf-spot. N. Y., Pa. 



Cercospora violae Sacc, leaf-spot. N. Y. 



Colletotrichum sp., anthracnose. Fla. 



C. violae-tricoloris R. E. Smith, leaf-spot. Mass., N. Y., N. J. 



Corticium vagum Berk, and Curt., root-rot. Del., Minn. 



Fusarium sp., wilt. Ohio, Mich. 



F. violae Wolf, stem-rot, root-rot. Nebr. 



Heterodera radicicola (Greef) Muell., root-knot. N. Y. 



Peronospora violae D By., downy mildew. Miss., 111., Nebr. 



Puccinia ellisiana Thuem., rust. Kans., Nebr. 



P. violae (Schum.) DC, rust. S. C, N. Dak. 



Pythium debaryanum Hesse, damping-off. Conn. 



Ramularia sp., leaf-spot. Wash. 



Sphaerotheca humuli fuliginea (Schl.) Salm., powdery mildew. Wash, 



Thielavia basicola (Berk, and Br.) Zopf, black root-rot. Conn. 



VITIS. 



Vitis sp., grape. 



Armillaria mellea (Vahl) Quel., root-rot. Wash. 



Bacterium tumefaciens EFS. and Town. (Phytomonas tumefaciens (EFS. 



and Town.) Com. S. A. B.), crown-gall. General. 

 Botrytis drier ea Auct., gray-mold rot. General on fruit. 

 Clitocybe monadelpha (Morgan) Sacc, root-rot. Mo., Ark., Okla., Tex. 

 Cryptosporella viticola (Reddick) Shear, dead-arm. General east of Great 



Plains. 

 Glomerella cingulata (Ston.) Spauld. and Schrenk, ripe-rot. Widespread 



east of Miss. River. 

 Guignardia bidwellii (Ell.) Viala and Ravaz, black-rot. General east of 



Great Plains. 

 Heterodera radicicola (Greef) Muell., root-knot. Calif. 

 Isariopsis clavispora (Berk, and Curt.) Sacc. (Cercospora viticola (Ces.) 



Sacc), leaf -spot. Southern States; Mich. 

 Melanconium fuligineum (Scrib. and Viala) Cav., bitter-rot. Widespread 



east of Great Plains, especially South. 

 Ozonium omnivorum Shear (Phymatoirichum omnivorum (Shear) Dug.), 



root-rot. Tex. 

 Pestalozzia uvicola Speg., leaf-blight. Fla., Miss., Tenn., Ohio, Ind., Nebr. 

 Phakopsora vitis (Thuem.) Syd., rust. S. C., Fla. 

 Plasmopara viticola (Berk, and Curt.) Berl. and DeToni, downy mildew. 



General east of Great Plains; Calif. 

 Rhytisma vitis Schw., tar-spot. N. Y., Pa. 

 Roesleria hypogaea Thuem. and Pass., root-rot. N. Y., Pa., Ohio, 111., Mo., 



N. Mex. 

 Septoria ampelina Berk, and Curt., leaf-spot. N. Y., Va., Tex., Kans. 

 Sphaceloma ampelinum D By. (Gloeosporium ampelophagum (Pass.) Sacc), 



anthracnose. General but erratic east of Great Plains. 

 Uncinula necator (Schw.) Burr., powdery mildew. General. 

 California vine disease, undet. Calif. 

 Chlorosis. Eastern States. 

 Little-leaf, undet. Calif. 

 Spanish measles, undet. Calif. 



WISTERIA. 



Wisteria sp., wisteria. 



Phyllosticta wistariae Sacc, leaf -spot. N. J., Tex. 

 Septoria wistariae Tharp, leaf -spot. Tex. 



YUCCA. 



Y. filamentosa, common yucca. 



Cercospora concentrica Cke. and Ell., leaf-spot. N. J. 



Coniothyrium concentricum (Desm.) Sacc, leaf -spot. Ala., N. Y., Idaho. 



Gloeosporium yuccaegenum Ell. and Ev., leaf -spot. Mo. 



Leptosphaeria filamentosa Ell. and Ev., leaf-spot. N. J. 



