LIST OF DISEASES OF ECONOMIC PLANTS 93 



RUBUS — Continued. 



Rubus sp., blackberry — Continued. 



Phragmidium imitans Arth., leaf -rust. Wash. 



Plectodiscella veneta (Speg.) Burk., anthracnose General. 



Sphaerotheca humuli (DC.) Burr., powdery mildew. Ohio, 111., Minn. 



V erticillium alboatrum Reinke and Berth., bluestem, wilt. N. Y., Minn., 



Wash. 

 Dwarf, undet. Wash., Oreg. 

 Mosaic, undet. N. Y., Ind., Iowa, Oreg., Calif. 

 Rubus sp., dewberry (cultivated and wild). 



Cercospora rubi Sacc, blotch. Fla., La., Tex., Ark. 



Fusisporium rubi Wint., double-blossom. N. Y., N. J., Del., Md., Miss., 



La., Tex., Ohio. 

 Gymnoconia interstitialis (Schl.) Lagh. (not on Lucretia dewberry), orange 



rust. General, especially in Eastern States. 

 Kuehneola uredinis (Lk.) Arth., yellow rust. General east of Miss. River. 

 Leptosphaeria coniothyrium (Fckl.) Sacc, cane-blight. N. C, Miss., Idaho. 

 Mycosphaerella rubi E. W. Roark, leaf-spot. General. 

 Peronospora potentillae D By., downy mildew. Conn. 

 P. rubi Rabh., downy mildew. Fla., Wash. 

 Pezizella lythri (Desm.) Shear and B. O. Dodge, fruit-rot. 

 Phyllosticta ruborum Sacc, leaf-spot. N. Y., Miss. 

 Plectodiscella veneta (Speg.) Burk., anthracnose. General. 

 Pucciniastrum americanum (Farl.). Arth., leaf -rust. Wis. (on *R. arcticus 



triflorus) . 

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

 Rubus sp., Logan blackberry. 



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



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



and Town.) Com. S. A. B.), crown-gall. Wash., Oreg. 

 Corticium vagum Berk, and Curt., crown-rot. Wash. 

 Mycosphaerella rubi E. W. Roark, leaf-spot. Mich., Wash., Oreg. 

 M, rubina (Pk.) Jacz., spur-blight. Wash. 



Plectodiscella veneta (Speg.) Burk., anthracnose. N. Y., Wash., Oreg. 

 Dwarf, undet. Wash., Oreg. 

 Mosaic, undet. Wash., Oreg., Calif. 

 Rubus sp., raspberry. 



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



Ascospora ruborum (Oud.) S. M. Zeller, leaf-spot. Mass., Oreg. 



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



and Town.) Com. S. A. B.), crown-gall. General. 

 Botrytis cinerea Auct., gray-mold rot. General on harvested fruit. 

 Cercospora rubi Sacc, blotch. Fla., Ala. 

 Corticium vagum Berk, and Curt., crown-rot. Idaho. 

 Cuscuta sp., dodder. Wis. 



Cylindrosporium rubi Ell. and Morgan, leaf-spot. Tex., Ohio, Wis., Mo. 

 Fusisporium rubi Wint., double-blossom. N. Y., Pa., Md. 

 Gymnoconia interstitialis (Schl.) Lagh., orange rust. General, especially in 



Eastern States. 

 Leptosphaeria coniothyrium (Fckl.) Sacc, cane-blight. East of Great Plains 



except Southern States; Pacific Northwest. 

 Leptothyrium pomi (Mont, and Fr.) Sacc, flyspeck. Mass., Ind. 

 Mycosphaerella rubi E. W. Roark, leaf-spot. General. 

 M. rubina (Pk.) Jacz., spur-blight. Widespread in Northern States. 

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

 rot. Tex. 

 Peronospora rubi Rabh., downy mildew. Wash. 



Phragmidium imitans Arth., leaf -rust. Widespread in Northern States. 

 P. occidentals Arth., rust. Colo. 

 Phyllosticta bicolor Pk., leaf -spot. N. Y. 

 Plectodiscella veneta (Speg.) Burk., anthracnose. General. 

 Pucciniastrum americanum (Farl.) Arth., rust. Conn., Mass., Vt., Md., 



Va., Wis., Iowa, N. Dak. 

 Rhizopus nigricans Ehr., black-mold rot. General. 



