LIST OF DISEASES OF ECONOMIC PLANTS 83 



PRUNUS— Continued. 



P. besseyi, P. cuneata, P. pumila, sand cherry. 



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



Town.) Com. S. A. B.), crown-gall. Minn. 

 Exoascus communis Sadeb., pockets. N. Y., Wis., N. Dak., S. Dak., Kans. 

 Plowrightia morbosa (Schw.) Sacc, black-knot. N. Dak. 

 Podosphaera oxyacanthae (DC.) D By., powdery mildew. Iowa, N. Dak., 



S. Dak., Nebr. 

 Sclerotinia cinerea (Bon.) Schroet. (Monilia oregonensis Barss and Posey), 



blossom blight. Wash., Oreg. 

 S.fructicola (Wint.) Rehm (S. americana (Wormald) Norton and Ezekiel), 



brown-rot. Minn., Nebr. 

 Tranzschelia punctata (Pers.) Arth., rust. Nebr., Kans. 

 P. pennsylvanica, pin cherry. 



Coccomyces hiemalis Hig., leaf-spot. N. Y., W. Va. 

 Exoascus cerasi (Fckl.) Sadeb., witches '-broom. N. H. 

 Phyllosticta congesta Heald and Wolf, leaf -spot, Wis. 

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

 Plowrightia morbosa (Schw.) Sacc, black-knot. Me., W. Va., Minn. 

 Podosphaera oxyacanthae (DC.) D By., powdery mildew. 111. 

 Tranzschelia punctata (Pers.) Arth., rust. 111. 

 P. serotina, wild black cherry. 



Coccomyces hiemalis Hig., leaf-spot. Widespread east of Great Plains. 



C. lutescens Hig., leaf-blight. N. Y., Pa., Ga., Miss., 111. 



Exoascus cerasi (Fckl.) Sadeb., witches '-broom. Mass., Ala. 



E. farlowii Sadeb., leaf-curl. Ala. 



E. pruni Fckl., pockets. Va., Ala. 



E. varius Atk., leaf deformation. Del., Fla., Ala. 



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



Gloeosporium serotinum Ell. and Ev., leaf-spot. Del. 



Phoradendron flavescens (Pursh) Nutt., mistletoe. Ind. 



Phyllosticta prunicola Sacc, leaf-spot. N. Y., Wis. 



P. serotina Cke., leaf -spot. Widespread east of Great Plains. 



P. virginiana (Ell. and Hals.) Seaver, leaf -spot. Iowa, Kans. 



Plowrightia morbosa (Schw.) Sacc, black-knot. Widespread east of Miss. 



River. 

 Podosphaera oxyacanthae (DC.) D By., powdery mildew. N. Y., 111. 

 Sclerotinia fructicola (Wint.) Rehm (S. americana (Wormald) Norton and 



Ezekiel), brown-rot. S. C. 

 S. seaveri Rehm. N. Y., Pa., Del., Md., Va., W. Va., Ga., Wis., Iowa. 

 Septoria cerasina Pk., leaf -spot. Mass. 

 S. ravenelii Thuem., leaf -spot. Pa., N. J., S. C, 111. 

 Tranzschelia punctata (Pers.) Arth., rust. S. C, Ala., Tex., Ind., 111., Iowa, 



Mo. 

 Valsa leucostoma (Pers.) Fr., die-back. N. Y. 

 P. virginiana, P. demissa, chokecherry. 



Bacterium pruni EFS. {Phytomonas pruni (EFS.) Com. S. A. B.), bacterial 



spot. N. Y. 

 Cercospora cerasella Sacc, leaf-spot. Kans. 

 C. circumscissa Sacc, shot-hole. N. Dak., Kans. 



Coccomyces hiemalis Hig., leaf -spot. Widespread in northern United States. 

 C. lutescens Hig., leaf -blight. N. Y., Wash. * 

 Cylindrosporium tubeufianum Allesch., leaf-spot. N. Y. 

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

 Exoascus cerasi (Fckl.) Sadeb., witches'-broom. Nebr., Colo. 

 E. confusus Atk., fruit deformation. Mass. 

 E. farlowii (Sadeb.) Sacc, leaf-curl. Wash. 

 E. pruni Fckl., pockets. N. Dak., Wash. 

 Gloeosporium prunicolum Ell. and Ev., leaf-spot. Wis. 

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

 Phyllosticta circumscissa Cke., leaf-spot. Kans., Wash. 

 P. prunicola Sacc, leaf-spot. N. Y. 



P. virginiana (Ell. and Hals.) Seaver, leaf -spot. Wis., Iowa, Kans., Mont. 

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



