88 BULLETIN 1366, U. S. DEPARTMENT OF AGRICULTURE 



QUERCUS — Continued. 

 Quercus spp., oaks — Continued. 



Gnomonia veneta (Sacc. and Speg.) Kleb., anthracnose. East of Great 



Plains. 

 Hydnum erinaceus Fr., wet heartwood rot. Ala., Ind., Ark. 

 Leptothyrium dryinvm Sacc., leaf-spot. N. J., Va., Ga., Miss., Tex., Wis. 

 Marssonia martini (Sacc. and Ell.) Magn., leaf-spot. Miss. Valley; Pa., Va. 

 M. quercus Pk., leaf-spot. Ind., Mo., Tex. 

 Microsphaera alni (Wallr.) Wint., powdery mildew. General east of Great 



Plains; Wash., Calif. 

 Monochaetia desmazierii Sacc, large leaf-spot. Pa., Southeastern States, 

 Nectria cinnabarina Fr., canker. Mass., Pa., Ala. 

 N. galligena Bres., European canker. Oreg. 



Ozonium omnivorum Shear (Phymatotrichum omnivorum (Shear) Dug.), root- 

 rot. Tex. 

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

 P. villosum Nutt., mistletoe. Oreg. 



Phyllactinia corylea (Pers.) Karst., powdery mildew. East of Miss. River. 

 Phyllosticta agrifolia Ell. and Ev., leaf-spot. Calif. 

 P. llvida Ell. and Ev., leaf-spot. Fla., La., Wis., Calif. 

 P. ludoviciana Ell. and Mart., leaf -spot. Fla., La. 



P. phomiformis Sacc, leaf-spot. Occurs scatteringly east of Great Plains. 

 P. quercus Sacc. and Speg., leaf-spot. N. Y., Ind., Wis. 

 P. quercus prini Ell. and Ev., leaf-spot. W. Va. 

 P. vesicatoria Thuem., leaf -spot. S. C. 

 P. wislizeni Ell. and Ev., leaf-spot. Calif. 

 Polyporus berkeleyi Fr., string-rot and raj'-rot. N. Y., Pa., N. C, Ala., Ark., 



Ind., Mo. 

 P. croceus Fr., white-piped rot. N. Y., N. C, Ark., Ohio, Ind. 

 P. dryadeus Fr., white wood-rot. Pa., Va., Tex., Okla., Ark., Ohio, Ind., 



Minn. 

 P. frondosus Fr., straw-colored rot. Mass., Va., Ark., Ind. 

 P. obtusus Berk., soft heartwood rot. Tenn., Ga., Ala., Minn. 

 P. rheades Fr., white pocket rot. General. 

 P. spraguei Berk., heart-rot. 



P. sulphureus (Bull.) Fr., brown-checked wood-rot. General. 

 Rhytisma erythrosporum Berk, and Curt., tar-spot. Tex. 

 Septoria dryina Cke., leaf-spot. Mass., S. C, Kans. 

 S. neglecta Earle, leaf-spot. Ala. 



Sphaeropsis quercina Cke. and Ell., twig canker. Pa. 

 Sphaerotheca lanestris Hark., powdery mildew. Ala., Miss., Ind., 111., 



Iowa, Calif. 

 Stereum subpileatum Berk, and Curt., honeycomb heart-rot. Southern 



States; Ohio, Ky., Mo. 

 Strumella coryneoidea Sacc. and Wint., canker. Conn., Mass., N. Y., Pa., 



111., Mo., Oreg. 

 Taphrina coerulescens (Mont, and Desm.) Tul., leaf blister. General east 



of Great Plains. 



RADICULA. 



R. armoracia, horseradish. 



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



Kans. 

 Alternaria brassicae (Berk.) Sacc, leaf-spot. Nebr., Mo. 

 A. hercidea (Ell. and Mart.) J. A. Elliott, gray leaf-spot. Conn., N. J., 



Ind. 

 Bacillus sp., bacterial root-rot. N. J. 

 Cercospora armoraciae Sacc, leaf -spot. Northern States. 

 Corticium vagum Berk, and Curt., stem-rot. N. J., Mich., 111., Wash. 

 Ozonium omnivorum Shear {Phymatotrichum omnivorum (Shear) Dug.), 



root-rot. Tex. 

 Phyllosticta decidua Ell. and Kell., leaf-spot. Wis. 

 P. orbicula Ell. and Ev., leaf -spot. N. Y. 

 Ramularia armoraciae Fckl., leaf -spot. General. 

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



