LIST OF DISEASES OF ECONOMIC PLANTS 43 



DAHLIA — Continued. 



Dahlia sp., dahlia — Continued. 



E. polygoni DC, powdery mildew. Del., Ga., Iowa, Mo., Calif. 



Fusarium sp., wilt. N. J. 



Heterodera radicicola (Greef) Muell., root-knot. Miss., Calif. 



Macrosporium sp., leaf -blight. Pa., Mo. 



Phoma dahliae Berk., blight. Ohio. 



Pythium debaryanum Hesse, damping-off. Conn., Wash. 



Scierotinia sclerotiorum (Lib.) Mass., stem-rot. Calif. 



Sclerotium rolfsii Sacc, stem-rot. Fla. 



Sporotrichum sp., root-rot. N. J. 



Verticillium alboatrum Reinke and Berth., wilt. 



Mosaic or yellows, undet. Conn., Del. 



DAUCXJS. 



D. carota, carrot. 



Alternaria radicina F. Meier, Drechs.. and E. D. Eddv, black-rot. Mass., 



N. Y. 

 Bacillus carotovorus L. R. Jones (Erwinia carotovora (Jones) Com. S. A. B.), 



soft-rot. General, especially east of Rocky Mts. 

 Botrytis sp., gray-mold rot. Pa., Wash. 

 Cercospora sp., leaf-blight. Md. 



C. apii carotae Pass., leaf -spot. N. Y., Pa,, N. J., Md., Ohio, Ind., Mich., Mo., 

 Corticium vagum Berk, and Curt., stem-rot. Mass., N. Y., Mich., 111., Tex. 



Wash., Oreg. 

 Heterodera radicicola (Greef) Muell., root-knot. Occurs in widely scattered 



States. 

 Macrosporium carotae Ell. and A. B. Langlois, leaf-blight. Occurs scat- 



teringly in Eastern States. 

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

 rot. Tex. 

 Rhizoctonia crocorum (Pers.) DC, violet root-rot. Wash. 

 Scierotinia intermedia G. B. Ramsey, root-rot. 111. 

 S. sclerotiorum (Lib.) Mass., watery soft-rot. Conn., N. Y., N. J.. La., 



Miss., Ind., 111. 

 Sclerotium rolfsii Sacc, stem-rot. S. C. 



DELPHINIUM. 



Delphinium spp., larkspur. 



Bacterium delphinii (EFS.) Bryan, black-spot. Me., N. H., Mass., Conn., 



N. Y., Pa., 111., Oreg. 

 Botrytis sp., gray-mold. Conn. 

 Cercospora delphinii Thuem., leaf-spot. Colo. 

 Corticium vagum Berk, and Curt., stem-rot. N. Y., Mich. 

 Erysiphe polygoni DC, powdery mildew. Me., Conn., N. Y., Pa., Minn. 

 Fusarium sp., wilt. Fla. 



Phyllosticta delphinii F. E. Clements, leaf-spot. Colo. 

 Puccinia clematidis (DC.) Lagh., rust. Nebr., Colo., Mont., Idaho, Oreg. 

 Sclerotium delphinii D. S. Welch, crown-rot. N. Y., Pa., N. J., Ind. 

 S. rolfsii Sacc, stem-rot. N. J., Fla,, La., Ind., 111. 

 Septoria delphinella Sacc, leaf-spot. Kans. 

 Urocystis sorosporioides Koern., smut. Calif. 



DEUTZIA. 



Deutzia sp., deutzia. 



Cercospora deutziae Ell. and Ev., leaf-spot. Del. 

 Heterodera radicicola (Greef) Muell., root-knot. Miss. 

 Phyllosticta deutziae Ell. and Ev., leaf -spot. N. J. 



DIANTHUS. 



D. barbatus, sweet-william. 



Corticium vagum Berk, and Curt., stem-rot. Conn., N. Y. 



Puccinia arenariae (Schum.) Wint., rust. Conn., Mass., N. Y., Pa., Miss. 



Septoria dianthi Desm., leaf -spot. Ala. 



Uromyces caryophyllinus (Schrank) Wint., rust. Nebr. 



