. Fungous diseases of plants, with chapters on physiology, culture methods and technique . PORIUM: OTHER SPECIES Cladosporium Cucumerinum Ell. and Arth. This fungus, likemany other species of the genus, is occasionally parasitic. It occurs upon melons, producingsunken spots on the fruit,and sometimes on thestems. This trouble is ap-parent, as a rule, only dur-ing very moist weather,and under such circum-stances the conidial stageof the fungus is developedabundantly over the af-fected areas, which ap-pear olivaceous in color (Fig. 135). Cladosporium fulvum Cke. Leaf mold of tomato. This fungus
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. Fungous diseases of plants, with chapters on physiology, culture methods and technique . PORIUM: OTHER SPECIES Cladosporium Cucumerinum Ell. and Arth. This fungus, likemany other species of the genus, is occasionally parasitic. It occurs upon melons, producingsunken spots on the fruit, and sometimes on thestems. This trouble is ap-parent, as a rule, only dur-ing very moist weather, and under such circum-stances the conidial stageof the fungus is developedabundantly over the af-fected areas, which ap-pear olivaceous in color (Fig. 135). Cladosporium fulvum Cke. Leaf mold of tomato. This fungus is commonduring moist weather, pro-ducing on tomatoes a leafblight which shows itselfin its effects upon the up-per surface by a moderateyellow discoloration, which may eventually appear as true spots.On the under surface the olivaceous growth of the fungus maybe seen. As the disease progresses the entire leaf may becomeyellowed, and often whole plants may be defoliated. The fungusis an active parasite, although belonging to a genus most of themembers of which are saprophytic in habit.. Fig. 135. Cladosporium Cucumerinum onMelon FUNGI IMPERFECT! 301 XIII. EARLY BLIGHT OF THE POTATOMacrosporiiim Solani E. & M. Chester, F. D. A Leaf Blight of the Potato. Del. Agl. Exp. Sta. Rept. 4: 58-60. 1891.Galloway, B. T. The Macrosporium Potato Disease. Agl. Sci. 7 : 370-382. 1893.Jones, L. R. Potato Blights. Vermont Agl. Exp. Sta. Rept. 9 : 66-88, 1895.Jones, L. R. Certain Potato Diseases and their Remedies. ^ermont Agl. Exp. Sta. Built. 72: 1-32. 1899.Jones, L. R., and Grout, A. J. Notes on Two Species of Alternaria. Built. Torrey Bot. Club 24: 254-258. 1897.Stewart, F. C, Eustace, H. J., and Sirrine, F. A. Potato Spraying Ex-periments in 1906. N. Y. (Geneva) Agl. Exp. Sta. Built. 279: 155-229. 1906.Sturgis, W. C. Notes on Early Blight of Potatoes. Conn. Agl. Exp. Sta. Rept. 18: 127-135. 1894. Habitat relations. The fungus causing the early bhght ofpotatoes was described in 1882. In 1891