THE FUNGOID DISEASES OF PLANTS. 297 



Cabbage. Club root, Plasmodiophora Brassicce Wor. Leaf 

 molds, Alternaria Brassicce and A. macrospora Sacc. 



Celery. Leaf blight, Cercospora Apii Fr. 



Corn. Leaf blight, Helminihosporium turcicum Pass. Rust, 

 Puccinia Sorghi Schw. Smut, Ustilago Zea (Beckm.) Ung. 



Cucumber. Downy mildew, Plasmopara cubensis (B. and C.). 

 Anthracnose, Colletotrichum lagenarium (Pass). Scab, Cladosporium 

 cucumerinum (Ell. and Arth.). 



Grape. Anthracnose, Sphaceloma ampelium DeBy. Black 

 rot, Guignardia bidwellii (Via. and Rav.). Downy mildew, 

 Plasmopora mticola (Ber. and De Ton.) Gray mold, Botrytis. 

 Powdery mildew, Uncinula necator Bur. 



Muskmelon. Anthracnose, Collototrichium lagenarium Ell. 

 and Hals. Downy mildew, Plasmopora cubensis Humph. 



Oat. Black-stem rust, Puccinia graminis. Smut, Ustilago 

 Avencs. Jens. 



Onion. Black mold, Macrosporium Porri Ell. Black spot, 

 Vermicularia circinans Berk. Downy mildew, Peronospora schlei- 

 deni Ung. Smut, Urocystis Cepula. 



Peach. Brown rot, Sclerotina frutigena Schrt. Leaf blight, 

 Cercosporella Persica Sacc. Leaf curl, Exoascus deformans Fckl. 

 Scab, Cladosporium carpophilum Thm. 



Pear. Black mold, Fumago vagans Pers. Leaf spot, Spetoria 

 piricola Desm. Rust, Gymnosporangium globosum Farl. 



Plumb. Black knot, Plowrightia morbosa Sacc. Brown rot, 

 Sclerotina frutigena Schrt. Powdery mildew, Podosphara oxya- 

 canthcB DeBy. 



Potato. Blight, Phytpphora infestans (one of the most destruct- 

 ive of our plant diseases). Dry rot, Fusarium oxysporum Schl. 

 Scab, Oospora scabies Thaxt. 



Squash. Anthracnose, Colletotrichum lagenarium (Pass.) Ell. 

 and Hals. Black mold, Rhizorpus nigricans Ehr. Metallic mold, 

 Choanephora cucurbitarim Tha. 



Strawberry. Fruit rot, Botrytis vulgaris Fr. Leaf blotch, 

 Ascochyta Fragaria Sacc. Leaf spot, Sphearella Fragarice Sacc. 



Tobacco. Frost fungus, Botryosporium pulchrum Cda. 



