LIST OF DISEASES OF ECONOMIC PLANTS 99 



SPINACIA— Continued. 



S. oleracea, spinach — Continued. 

 Fusarium sp., root-rot. Tex., Oreg. 

 F. spinaciae Sherb., wilt. Idaho. 

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

 Heterosporium variabile Cke., leaf-spot. Conn., Mass., Va., Mo., Tex., 



Calif. 

 Macrosporium cheiranthi (Lib.) Fr., leaf-spot. Ohio. 

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



root-rot. Tex. 

 Peronospora effusa (Grev.) Ces., downy mildew. General. 

 Phyllosticta chenopodii Sacc, leaf-spot. N. J., Del., Va. 

 Phylophthora sp., crown-rot. N. J., Ind. 

 Puccinia sarcobati (Pk.) Bethel, rust. Ariz., Wash., Oreg. 

 Pythium debaryanum Hesse, damping-off. Conn. 

 Malnutrition, nonpar. Va. 

 Mosaic, undet. Widespread. 



SPIRAEA. 



Spiraea sp., spirea. 



Bacillus amylovorus (Burr.) Trev. (Erwinia amylovora (Burr.) Com. 



S. A. B.), blight. Md. 

 Cercospora rubigo Cke. and Hark., leaf-spot. Kans. 

 Cylindrosporium filipendulae Thuem., leaf-spot. Wis., Wash., Oreg. 

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



root-rot. Tex. 

 Podosphaera oxyacanthae DC, powdery mildew. New England, Ohio, Mo., 



Wyo., Wash. 

 Rhopalidium cercosporelloides Dearn., leaf-spot. Idaho. 

 Septoria salicifolia (Trel.) Ell. and Ev., leaf-spot. Wis., Kans. 

 Sphaerotheca humuli (DC.) Burr., powdery mildew. Conn., N. Y. 



STAPHYLEA. 



S. trifolia, American bladdernut. 



Ramularia isarioides Sacc, leaf-spot. Pa., Wis., Mo. 

 Septoria cirrhosa Wint., leaf-spot. Mo. 



STIZOIOBIUM. 



S. deeringianum, velvetbean. 



Aplanobacter stizolobii Wolf, bacterial leaf-spot. N. C. 



Bacterium vignae M. W. Gardner and J. B. Kendrick, bacterial spot. Ind. 



Cercospora mucunae Syd., leaf-spot. Ala. 



C. stizolobii Syd., leaf-spot. N. C, S. C, Fla. 



Corticium vagum Berk, and Curt., stem-rot. Ga., La. 



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



Phyllosticta mucunae Ell. and Ev., leaf-spot. Ala. 



Sclerotium rolfsii Sacc, stem-rot. Ga., Ala. 



SYMPHORICARPOS. 



Symphoricarpos sp., snowberry, coralberry. 



Cercospora symphoricarpi Ell. and Ev., leaf-spot. Nebr., Kans., Mont. 

 Fomes ribis (Schum.) Fr., root-rot. N. Dak., Kans. 

 Microsphaera diffusa Cke. and Pk., powdery mildew. General. 

 Nectria coryli Fckl., canker. N. Dak. 



Puccinia abundans (Pk.) Jack., rust. Great Plains and westward. 

 P. symphoricarpi Hark., rust. Western States. 

 Septoria oedospora F. E. Clements, leaf-spot. Colo. 



S. symphoricarpi Ell. and Ev., leaf-spot. N. Dak., Nebr., Mont., Idaho, 

 Wash. 



SYRINGA. 



Syringa sp., lilac 



Hymenochaete agglutinans Ell., stem girdling. Conn. 

 S. persica, Persian lilac. 



Cercospora lilacis (Desm.) Sacc, leaf -spot. Miss. 



Microsphaera alni (Wallr.) Wint., powdery mildew. Iowa. 



