48 DISEASES OF FIELD & GARDEN CROPS. [OH. 



X-400 



FIG. 16. MILDEW OF ONIONS. 



Peronospora Schleideniana, Ung. Enlarged 400 diameters. 



and mature fertilised oospores or resting-spores at E and 

 F, enlarged 400 diameters. These bodies carry on the life 

 of the fungus in a hibernating state during the winter 



