LIST OF DISEASES OF ECONOMIC PLANTS 17 



AGROSTIS. 



A. capillaris, bentgrass. 



Puccinia graminis Pers., stem-rust. General east of Great Plains. 



Scolecotrichum graminis Fckl., leaf -spot. Ind. 



Ustilago striaeformis (West.) Niessl, stripe-smut. Conn., Miss. Valley. 

 A. palustris, redtop. 



Claviceps purpurea (Fr.) Tul., ergot. Pa., Mich., Minn., N. Dak. 



Colletotrichum graminicolum (Ces.) Wils., anthracnose. Pa. 



Corticium vagum Berk, and Curt., root-rot. General. 



Erysiphe graminis DC, powdery mildew. Minn. 



Helminthosporium dematioideum Bub. and Wrob., leaf-spot. Conn., N. Y. 



Ophiobolus graminis Sacc, take-all. N. Y. 



Puccinia graminis Pers., stem-rust. General east of Great Plains. 



Pythium sp., damping-off. Conn. 



Sclerotium rhizodes Auer., Sclerotium blight. Conn. 



Scolecotrichum graminis Fckl., leaf-spot. Pa., Wis. 



Urocystis agropyri (Preuss) Schroet., smut. Pa., Wis. 



Ustilago striaeformis (West.) Niessl, stripe-smut. General east of Great 

 Plains. 

 A. stolonifera, carpet bentgrass. 



Corticium vagum Berk, and Curt., root-rot. General. 



Helminthosporium giganteum Heald and Wolf, leaf-spot. D. C. 



H. stenacrum Drechs., leaf-spot. Conn. 



AILANTHUS. 



A. glandulosa, tree-of -heaven. 



Cercospora glandulosa Ell. and Kell., leaf-spot. Ala., 111., Kans., Nebr., Tex. 

 Nectrta cinnabarina Fr., canker. N. J., Kans. 



ALLIUM. 



A. ascalonicum, shallot. 



Colletotrichum circinans (Berk.) Vogl., smudge. 111., Wis. 

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

 Peronospora schleideni Ung., downy mildew. La. 

 A. cepa, onion. 



Aspergillus niger Tiegh., black-mold. General. 



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



soft-rot. General. 

 B. cepivorus Del., rot. W. Va. 

 Botrytis sp., gray-mold. General. 

 B. allii M. T. Munn, neck-rot. N. Y., Ohio, 111., Mich., Wis., Pacific 



Northwest. 

 B. byssoidea Walker, mycelial neck-rot. Conn., 111., Wis. 

 B. squamosa Walker, small sclerotial neck-rot. 111., Wis. 

 Colletotrichum circinans (Berk.) Vogl., smudge. General east of Great 



Plains. 

 Corticium vagum Berk, and Curt., stem-rot. Ohio, Wash. 

 Cuscuta sp., dodder. 111., Wis., Calif. 

 Fusarium sp., root-rot. Frequent occurrence. 

 F. cepae J. Hanzawa, bulb rot. 111. 



F. malli Taub., pink-root. Occurs in widely scattered States. 

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

 Macrosporium porri Ell., mold. New England, Miss., Ind., Utah. 

 M. sarcinula parasiticum Thuem., black stalk-rot. General.' 

 Peronospora schleideni Ung., downy mildew. General. 

 Puccinia porri (Sow.) Wint., rust. Conn. 

 Pythium debaryanum Hesse, damping-off. Mass. 

 Sclerotium cepivorum Berk., white-rot. Va., Ky., Oreg. 

 S. rolfsii Sacc, stem-rot. Ala. 

 Urocystis cepulae C. C. Frost, smut. General. 



