LIST OF DISEASES OF ECONOMIC PLANTS 87 



PYRUS— Continued. 



P. communis, pear — Continued. 



Coryneum foliicolum FckL, leaf-spot. Ind. 



Fabraea maculata (L6v.) Atk., leaf-blight. General. 



Gloeodes pomigena (Schw.) A. S. Colby (Phyllachora pomigena (Schw.) 



Sacc), sooty blotch. Mass. to N. C, westward to 111., Tex. 

 Gloeosporium perennans Zeller and Childs, perennial canker. Wash., Oreg. 

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



Mass., N. J., S. C, Ga., Tex., Ark. 

 Gymnosporangium blasdaleanum (Diet, and Holw.) Kern, incense-cedar 



rust. Oreg. 

 G. globosum FarL, rust. Conn., N. Y., Ohio, Colo. 

 G. nelsoni Arth., rust. Colo. 

 Hendersonia foliorum FckL, leaf -spot. Tex. 

 Leptothyrium carpophilum Pass. , flyspeck. Tex. 

 Mycosphaerella sentina (Fr.) Schroet., leaf-spot. General east of Great 



Plains; Oreg. 

 Myxosporium corticolum Edg. (Dermatea corticola (Edg.) Arn.), surface bark 



canker. N. Y., Mich., Oreg. 

 Nectria galligena Bres., European canker. Oreg. 



Neofabraea malicorticis (A. B. Cordley) Jack., anthracnose. Wash., Oreg. 

 Nummularia discreta (Schw.) Tul., blister canker. Del. 

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



root-rot. Tex., N. Mex., Ariz. 

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

 P. flavescens macrophyllum Engelm., mistletoe. Ariz., N. Mex. 

 Phyllosticta pyrorum Cke., leaf -spot. S. C, 111. 

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



Widespread east of Great Plains; Oreg. 

 Phytophthora cactorum (Leb. and Cohn) Schroet., rot. Conn., Ind., Mich. 

 Podosphaera leucotricha (Ell. and Ev.) Salm., powdery mildew. Colo., 



Wash. 

 P. oxyacanthae (DC.) D By., powdery mildew. Colo. 

 Pythiacystis citrophthora E. H. and R. E. Smith, citrus brown-rot. Calif. 

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



blossom blight. Pacific coast. 

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



brown-rot. Conn., Pa., Del., S. C, Ga., Fla., Miss., Ind., 111., Wash. 

 Septoria nigerina FckL, leaf-spot. N. Y. 

 Venturia pyrina Aderh., scab. General. 

 Xylaria sp., root-rot. Ind. 

 Bitter-pit, undet. N. Y., Wash., Oreg. 

 Brown-blotch, undet. N. J. 

 Chlorosis, nonpar. Tex., N. Mex., Wash. 

 Measles, undet. Fla. 



QUERCUS. 



Quercus spp., oaks. 



Actinopelte japonica Sacc, leaf-spot. N. J. 



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



Cercospora polytricha Cke., leaf -spot. S. C, Ga. 



Cronartium cerebrum (Pk.) Hedge, and Long, rust. East of Great Plains; 



Calif. 

 C. fusiforme (Pk.) Hedge, and Hunt, rust. Ohio. 

 C. strobilinum (Arth.) Hedge, and Hahn, rust. Fla. 

 Cylindrosporium microspilum Sacc. and Wint., leaf -spot. Mo. 

 Cytospora chrysosperma (Pers.) Fr., canker. R. I., N. J., Pa. 

 Diplodia longispora Cke. and Ell., twig-blight. Conn., N. Y., N. J., Pa., Md., 



Va., W. Va. 

 Fomes applanatus Fr. (Ganoderma applanatum (Pers.) Pat.), white-streaked 



rot. Me., N. H., Pa., Ky., Minn., Calif. 

 F. everhartii (Ell. and Gall.) Schrenk, white-rot. Conn., N. J., Pa., N. C, 



Ohio, Ind., Minn., Mont. 

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



F. igniarius (L.) Fr., white heart-rot. Conn., Mass., N. C, Minn., Okla. 

 F. lobatus Schw., spongy white-rot. Ark. 



