208 



GRASSES OF IOWA. 



Fig. 97. Oladosporlum and other fungi on kernels of corn. Kernels of corn 

 Injured'on top. 

 Fig. 97 \.. Oladosporium-Uke fungus. S, spores; c. conldlophores; 2, Macrosporium. 



Fig. 97B. Oladosporlum Zeae from corn kernels; a, conldlophores; b, c, spores. 



Fig. 93. Spot Disease of Orchard Grass (Scolecotriehum graminum) Cross-section 

 of leaf, general fruiting layer of fungus with conldlophores and conidla; .4., spores 

 germinating (Trelease). 



over by the fruits, and that the disease can be prevented by 

 treatment with hot water. A species of Cladosporium com- 

 monly affects the kernels of maize, at times quite troublesome. 

 According to Peck the C. Zeae Pk. is parasitic and attacks the 

 unripened grasses. 



SPOT DISEASE OF ORCHARD GRASS. 



Of the many imperfect fungi which attack grasses, one of 

 the most serious is the spot disease {Scolecotriehum graminis)^ 



