90 BULLETIN 1366, U. S. DEPARTMENT OF AGRICULTURE 



RHODODENDRON— Continued. 



Rhododendron sp., rhododendron — Continued. 



Hendersonia concentrica Ell. and Ev., leaf-spot. N. C. 



Laestadia rhodorae Berl. and Vogl., leaf -spot. N. Y. 



Melampsoropsis piperiana Arth., rust. Oreg., Wash, (on R. calif ornicum) . 



M. roanensis Arth., rust. Tenn. 



Pestalozzia funerea Desm., leaf -spot. Va. 



P. guepini Desm., leaf-spot. Conn., N. Y., N. J., Pa., Del., Ind., Wash. 



Phyllosticta maxima Ell. and Ev., leaf-spot. Conn., N. Y., N. J. 



P. saccardoi Thuem., leaf -spot. N. Y. 



Septoria rhododendri Cke., leaf -spot. Me. 



Sporocybe azaleae (Pk.) Sacc, bud-blight. Pacific coast. 



Witches '-broom and white-leaf, undet. Pacific coast (on R. calif ornicum) . 



REODORA. 



R. canadense, rhodora. 



Exobasidium vaccinii (Fckl.) Wor., hypertrophy. N. H. 

 Pucciniastrum myrtilli (Schum.) Arth., rust. N. H. 



RH0D0TYP0S. 



R. kerrioides, jetbead. 



Ascochyta rhodotypi H. W. Anderson, leaf -spot. 111. 

 RHUS. 



R. copallina, shining sumac. 



Cercospora copallina Cke., leaf-spot. S. C, Fla., La. 



C. rhoina Cke. and Ell., leaf-spot. Widespread east of Great Plains. 



Cylindrosporium toxicodendri Ell. and Ev., leaf-spot. N. J. 



Exoascus purpurascens (Ell. and Ev.) Sadeb., leaf-curl. Mass., N. J., Ga. 



Sphaerotheca humuli (DC.) Burr., powdery mildew. 111., Mo. 

 R. cotinus, smoketree. 



Cercospora rhoina Cke. and Ell., leaf-spot. Ala. 



Septoria rhoina Berk, and Curt., leaf-spot. New England, N. Y. 

 R. glabra, smooth sumac. 



Cercospora rhoina Cke. and Ell., leaf -spot. Va. to Nebr. and southward. 



Cladosporium aromaticum Ell. and Ev. Nebr. 



Septoria rhoina Berk, and Curt., leaf-spot. 111., Minn., Kans. 



Sphaerotheca humuli (DC.) Burr., powdery mildew. Iowa, Miss. 

 R. typhina, staghorn sumac. 



Cercospora rhoina Cke. and Ell., leaf -spot. Md. 



Exoascus purpurascens (Ell. and Ev.) Sadeb., leaf-curl. Md. 



Physalospora malorum (Pk.) Shear (P. cydoniae Am. Auct.), canker. N. Y. 



Septoria rhoina Berk, and Curt., leaf-spot. Miss., Iowa. 



Sphaerotheca humuli (DC.) Burr., powdery mildew. Pa. 



RIBES. 



R. nigrum, European black currant. 



Cronartium ribicola Fisch., blister rust. New England, N. Y., Wash., Oreg. 

 Microsphaera grossulariae (Wallr.) L6v., powdery mildew. Mont. 

 Mycosphaerella grossulariae (Ft.) Lindau, leaf-spot. Conn., Iowa. 

 Pseudopeziza ribis Kleb., anthracnose. N. H. 

 Puccinia grossulariae (Schum.) Lagh., rust. Conn. 

 R. vulgare, red currant, white currant. 



Botryosphaeria ribis Gross, and Dug., cane-blight. Mass., Conn., N. Y. to 



Va., west to 111. 

 Cercospora angulata Wint., leaf-spot. N. Y. to Va., west to Iowa and Kans. 

 Cronartium ribicola Fisch., blister rust. North Atlantic States; Mich., 



Minn. 

 Fomes ribis (Schum.) Fr., root-rot. N. Y., N. J., Ind., Utah. 

 Glomerella cingulata (Ston.) Spauld. and Schrenk, bitter-rot. Conn. 

 Mycosphaerella grossulariae (Fr.) Lindau, leaf-spot. General in Northern 



States. 

 Nectria ditissima Tul., canker. N. Y. 

 Phyllosticta grossulariae Sacc, leaf-spot. N. J. 

 Plasmopara ribicola Schroet., downy mildew. Wis. 



