LIST OF DISEASES OF ECONOMIC PLANTS 85 



PRUNUS— Continued . 

 Prunus spp., plum. 



Armillaria mellea (Vahl) Quel., root-rot. Minn., N. Dak., Tex., Calif. 

 Bacillus amylovorus (Burr.) Trev. (Erwinia amylovora (Burr.) Com. S. A. B.), 

 blight. Vt., N. J., Pa., Miss., Tex., Ohio, Mich., S. Dak., Nebr., Colo., 

 Ariz., Wash. 

 Bacterium cerasi F. L. Griffin, bacterial gummosis. Tex., Kans., Ariz., Calif. 

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

 General east of Great Plains. 



B. tumefaciens EFS. and Town. (Phytomonas tumefaciens (EFS. and 

 Town.) Com. S. A. B.), crown-gall. Occurs in widely scattered States. 



Botrytis cinerea Auct., fruit-rot. Wash. 



Cercospora circumscissa Sacc, shot-hole. N. Y., Kans., Wash. 



Cladosporium carpophilum Thuem., scab. Widespread. 



Coccomyces prunophorae Hig., leaf -spot. General. 



Coryneum beijerinckii Oud., blight. Pacific coast, Idaho. 



Diplodia pruni Fckl., twig-blight. Fla. 



Exoascus communis Sadeb., pockets. Iowa. 



E. mirabilis Atk., hypertrophy. Widespread east of Great Plains. 



E. pruni (Berk.) Fckl., pockets. General. 



Fomes fulvus Fr., brown heartwood rot. Minn., Nebr. 



F. pinicola Fr., brown crumbly rot. Oreg. 

 Heterodera radicicola (Greef) Muell., root-knot. S. C. 

 Lasiodiplodia trifiorae Hig., wilt. Md., Va., Ga. 

 Lenzites saepiaria Fr., dry-rot. Oreg. 



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



root-rot. Ariz. 

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

 Phyllosticta circumscissa Cke., shot-hole. N. J., Ga., Wash. 

 P. congesta Heald and Wolf, blotch. Ga., Tex. 

 P. prunicola Sacc, leaf-spot. Minn. 

 Plowrightia morbosa (Schw.) Sacc, black-knot. General except Pacific 



coast. 

 Podosphaera oxyacanthae (DC.) D By., powdery mildew. Widespread east of 



Great Plains. 

 Polyporus lacteus Fr., heart-rot. Va., Ind., Wash., Oreg. 

 Polystigma rubrum (Pers.) DC, red leaf-spot. 



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

 Schizophyllum commune Fr., sap-rot. Minn., Nebr. 

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



Ezekiel), brown-rot. General. 

 Septobasidium sp., canker. Fla. 



S. retiforme (Berk, and Curt.) Pat., canker. Ala., Fla. 

 Septoria cerasina Pk., leaf -spot. Mass. 

 Trametes carnea (Nees) Cke., wood-rot. Oreg. 

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

 Valsa leucostoma (Pers.) Fr., die-back. Pa., S. C, Tex., Ohio, Mo., Colo., 



Idaho. 

 P. americana, American wild plum. 



Cercospora circumscissa Sacc, shot-hole. Nebr. 



C. prunicola Ell. and Ev., leaf-spot. Ala., La. 

 Cladosporium carpophilum Thuem., scab. Wis., Iowa, Calif. 

 Coccomyces prunophorae Hig., shot-hole. Ind., S. Dak. 

 Exoascus cerasi (Fckl.) Sadeb., witches'-broom. 111., Iowa. 

 E. communis Sadeb., pockets. General over range of host. 

 E. decipiens Atk., leaf-curl. Mont. 



E. mirabilis Atk., hypertrophy. Miss. 



E. pruni Fckl., pockets. N. Dak., Iowa, Miss. 



Fomes fulvus Fr., brown heartwood rot. Ohio, Ind., N. Dak., S. Dak., 



Nebr., Kans. 

 Phyllosticta circumscissa Cke., leaf -spot. 111. 

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

 Plowrightia morbosa (Schw.) Sacc, black-knot. General over range of host. 

 Podosphaera oxyacanthae (DC.) D By., powdery mildew. General over range 



of host. 

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



Ezekiel), brown-rot. N. Y., Va., Miss., Iowa. 



