68 BULLETIN 1366, U. S. DEPARTMENT OF AGRICULTURE 



OIEA — Continued 



0. europaea, olive — Continued. 



Cycloconium oleaginum Cast., leaf -spot. Calif. 



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

 rot. Tex. 



ORYZA. 



0. sativa, rice. 



Cercospora oryzae Miyake, leaf-spot. La. 



Corticium vagum Berk, and Curt., foot-rot. Ark. 



Fusarium minimum Fckl., wilt. La. 



Hehninthosporium sp., leaf-spot. S. C, Ark. 



H. oryzae Van Breda de Haan, blight. Fla., La. 



Ophiobolus sp., foot-rot. Ark. 



Phoma glumarum Ell. and Tr., glume-blight. Miss. 



Piricularia grisea (Cke.) Sacc, blast. Occurs in all States where rice is 



grown. 

 Sclerotium oryzae Catt., stem-rot. La., Ark. 

 S. rolfsii Sacc, seedling blight. La. 

 Sphaerotheca sp., powdery mildew. N. C. 

 Tilletia horrida Tak., black-smut. S. C, Ga., La., Ark. 

 Ustilaginoidea virens (Cke.) Tak., green-smut. Ga., La. 

 Straighthead, nonpar. General in States in which rice is grown. 



OSMANTHUS. 



Osmanthus sp., osmanthus. 



Phyllosticta oleae Ell. and Mart., leaf -spot. Fla. 

 P. sinuosa Ell. and Mart., leaf -spot. Fla., Miss. 

 P. terminalis Ell. and Mart., leaf-spot. Fla. 



OSTRYA. 



0. virginiana, hophornbeam. 



Fomes igniarius (L.) Fr., white heart-rot. N. Dak., S. Dak. 



Gloeosporium robergiae Desm., leaf-spot. Wis. 



G. robergiae dendriticum Davis, leaf-spot. Pa. 



Microsphaera alni (Wallr.) Wint., powdery mildew. N. Y., 111., Iowa. 



Phyllactinia corylea (Pers.) Karst., powdery mildew. General over range of 



host. 

 Septoria ostryae Pk., leaf -spot. N. Y. 



Taphrina virginica Seym, and Sadeb., leaf-spot. N. H., Mass., Ala., Wis. 

 Iowa. 



OXYDENDRUM. 



0. arboreum, sourwood. 



Cercospora oxydendri Tr. and Earle, leaf-spot. Ala. 

 Phyllosticta oxydendri Ell. and Ev., leaf-spot. W, Va. 



PAEONIA. 



Paeonia sp., peony. 



Armillaria mellea (Vahl) Quel., root-rot. Mich., Oreg. 



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



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

 Botrytis sp., seed-rot. Pa. 

 B. paeoniae Oud., blight. Widespread. 

 Cerospora variicolor Wint., leaf-spot. Ind., Ky., Mo., Nebr. 

 Cladosporium paeoniae Pass., leaf -mold. General. 

 Corticium vagum Berk, and Curt., stem-rot. Minn. 

 Fusarium sp., root-rot, stem-rot. Ind., Mo., Nebr. 

 Heterodera radicicola (Greef) Muell., root-knot. N. Y., Pa., S. C, Miss., 



Ohio, Ind., N. Dak., Nebr., Wash. 

 Phyllosticta commonsii Ell. and Ev., leaf -spot. Del., Ind. 

 Phytophthora sp., blight. Conn., Pa., Ind., Kans. 

 Septoria paeoniae berolinensis Allesch., leaf -spot. N. Y. 

 Verticillium alboatrum Reinke and Berth., wilt. Kans. 

 Mosaic, undet. Mass., Conn., Va., Ohio, Kans., Wash. 



