LIST OF DISEASES OF ECONOMIC PLANTS 27 



BET ULA— Continued. 



B. occidentalis, western birch — Continued. 



Gnomonia campylostyla Auer. Colo. 



Melampsoridium betulae (Schum.) Arth., rust. Mont., Idaho. 



Phyllactinia corylea (Pers.) Karst., powdery mildew. Mont., Wyo. 



Septoria betulicola Pk., leaf -spot. Wash. 



Trametes pint (Brot.) Fr. {Fomes pini (Thore) Karst.), honeycomb rot. 

 Idaho. 

 B. papyrifera, canoe birch. 



Exoascus betulinus (Rostr.) Sadeb., witches'-broom. Wis. 



Fomes applanatus (Pers.) Wallr. {Ganoderma applanation (Pers.) Pat.), 

 white-streaked rot. Me., Minn. 



F. everhartii (Ell. and Gall.) Schrenk, white-rot. Minn. 



F. fomentarius (L.) Fr., white sap wood rot. Mass., Minn. 



F. igniarius (L.) Fr., white heart-rot. Mich., Minn. 



Gloeosporium betulae-papyriferae Dearn. and Overh., anthracnose. Pa. 



Magnusiella flava (Farl.) Sadeb., yellow leaf blister. Northeastern States. 



Melampsoridium betulae (Schum.) Arth., rust. Me. 



Phyllactinia corylea (Pers.) Karst., powdery mildew. Iowa. 



Polyporus betulinus (Bull.) Fr., powdery sapwood rot. Mass., Conn., 

 Minn. 

 B. populifolia, gray birch. 



Fomes fomentarius (L.) Fr., white sapwood rot. Me. 



Magnusiella flava (Farl.) Sadeb., yellow leaf blister. Northeastern States. 



Melampsoridium betulae (Schum.) Arth., leaf-rust. Northeastern States. 



Melanconium bicolor Nees, canker. N. Y. 



Polyporus betulinus (Bull.) Fr., powdery sapwood rot. Northeastern 

 States. 



Septoria betulina Pk., leaf-spot. Wis. 

 . Venturia ditricha (Fr.) Aderh. Me., N. Y. 



3IGN0NIA. 



B. capreolata, crossvine. 



Cercospora capreolata Ell. and Ev., leaf-spot. Miss. 



Dimerosporium tropicale Speg., sooty mold. Miss. 

 B. radicans, trumpetcreeper. 



Cercospora pallida Ell. and Ev., leaf-spot. La. 



C. sordida Sacc, leaf -blight. General east of Great Plains, especially in 

 the South. 



Erysiphe cichoracearum DC, powdery mildew. 111. 



Hendersonia peckii Clint. N. Y. 



Microsphaera alni (Wallr.) Wint., powdery mildew. Va., Ala., Ohio, Ind., 

 Miss. 



Phyllosticta tecomae Sacc, leaf-spot. Miss. 



Septoria tecomae Ell. and Ev., leaf-spot. W. Va., Tex. 



BRAS SIC A. 



B. campestris, rutabaga. 



Albugo Candida (Pers.) O. Kuntze, white-rust. Mass. 



Alternaria brassicae (Berk.) Sacc, black leaf -spot. Va. 



Bacterium campestre (Pam.) EFS. (Phytomonas campestre (Pam.) Com. 

 S. A. B.), black-rot. Va., Wis., Minn., Iowa. 



Erysiphe polygoni DC, powdery mildew. Conn., Fla., Wash. 



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



Mycosphaerella brassicicola (Fr.) Lindau, ring-spot. Calif. 



Peronospora parasitica (Pers.) D By., downy mildew. Fla., Iowa. 



Phoma lingam (Tode) Desm., black-leg. Ga. 



Plasmodiophora brassicae Wor., clubroot. Minn., N. Dak. 

 B. oleracea, cabbage. 



Albugo Candida (Pers.) O. Kuntze, white-rust. Ky., Idaho. 



Alternaria brassicae (Berk.) Sacc, black leaf-spot. General. 



A. herculea (Ell. and Mart.) J. A. Elliott, gray leaf-spot. Calif. 



Bacillus carotovorus L. R. Jones (Erwinia carotovora (Jones) Com. S. A. B.), 

 soft-rot. General. 



