FIG. 21. SPINACH DISEASES. 



a. Downy mildew, b. cross section showing fruiting stalk of the downy mildew 

 fungus on infected spinach leaf, c. cross section showing leaf affected with white 

 smut, d. Anthracnose of spinach, e. cross section showing acervulus of Colletolri- 

 chum spinacice, f. leaf spot, g. spores of the leaf spot fungus Heterosporium variabile- 

 (b. c. e. after Halsted, d. after Reed). 



