

LIST OF DISEASES OF ECONOMIC PLANTS 53 



HORDEUM — Continued. 



H. vulgare, barley — Continued. 



Puccinia anomala Rostr., leaf -rust. General. 



P. glumarum (Schm.) Eriks. and Henn., stripe-rust. West of Great Plains. 



P. graminis Pers., stem-rust. General. 



Pyrenophora teres (Died.) Drechs.., net-blotch. General. 



Rhizoctonia sp., foot-rot. Wash. 



Rhynchosporium secalis (Oud.) Davis, scald. Upper Miss. Valley; Pacific 



Northwest; Calif. 

 Septoria passerinii Sacc, leaf-spot. Mich., Minn., Iowa, N. Dak., S. Dak., 



Idaho, Oreg. 

 Ustilago hordei (Pers.) Kell. and Sw., covered smut. General. 

 U. nuda (Jens.) Kell. and Sw., loose smut. General. 



HUMULUS. 



H. lupulus, hop. 



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



Colletotrichum sp., anthracnose. N. Y. 



Cylindrosporium humuli Ell. and Ev., leaf-spot. N. Y., N. J., Del., Mich., 



Wis., Iowa. 

 Erysiphe cichoracearum DC, powdery mildew. Utah. 

 Phyllosticta decidua Ell. and Kell., leaf -spot. Wis. 

 P. humuli Sacc. and Speg., leaf -spot. Mass., Iowa. 

 Plasmopara humuli Miyabe and Tak., downy mildew. Wis. 

 Septoria lupulina Ell. and Kell., leaf -spot. Kans. 

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



Wyo., Pacific coast. 



HYACINTHUS. 



H. orientalis, common hyacinth. 



Bacterium hyacinthi J. H. Wakker (Phytomonas hyacinthi (Wakker) Com. S. 



A. B.), yellow disease. Mass. 

 Fusarium sp., bulb-rot (dry). Mo., Wash. 

 F. bulbigenum Cke. and Mass., bulb-rot. R. I. 



Tylenchus dipsaci (Kuehn) Bast., stem and bulb nematode. Wash. 

 Mosaic, gray disease, undet. Wash. 



HYDRANGEA. 



Hydrangea sp., hydrangea. 

 Ascochyta sp., leaf -spot. Pa. 

 Botrytis cinerea Auct., blight. Wash. 

 Cercospora hydrangeana Tharp, leaf -spot. Ala., Tex. 

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

 Phyllosticta hydrangeae Ell. and Ev., leaf-spot. N. J., Ala., Ind. 

 Pucciniastrum hydrangeae (Berk, and Curt.) Arth., rust. Frequent east of 



Miss. River. 

 Septoria hydrangeae Bizz., leaf -spot. Miss. 



HYDRASTIS. 



H. canadensis, goldenseal. 



Botrytis sp., stem-rot. Conn., N. Y., Ind., Mich., Wis., Wash. 



Fusarium sp., wilt. N. Y., Ohio, 111. 



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

 HEX. 



Ilex spp., holly, winterberry. 



Cercospora ilicis Ell., leaf-spot. N. J., Ala., Miss. 



Microsphaera alni (Wallr.) Wint., powdery mildew. Ala., 111., Wis. 



Phyllosticta concomitans Ell. and Ev., leaf -spot. La. 



P. haynaldi Roum. and Sacc, leaf-spot. W. Va. 



P. ilicicola (Cke. and Ell.) Ell. and Ev., leaf-spot. N. Y. 



P. opaca Ell. and Ev., leaf-spot. W. Va. 



P. terminalis Ell. and Mart., leaf -spot. Fla. 



Ramularia alaterni Thuem., leaf -spot. Mich. 



R. prinos Pk., leaf-spot. N. Y., Wis. 



Rhytisma concavum Ell. and Kell., tar-spot. Ohio. 



R. ilicicolum Schw., tar-spot. Va., Miss. 



