10 



DISEASES OF FIELD & GARDEN CROPS. [OH. 



400- 



FIG. 1. CLOVEK MILDEW. 



Peronospora trifoliorum, D.By. 



Enlarged 400 diameters. Spore enlarged 1000 diameters. 



the original attack of the foe. As the fungus hibernates 

 in decaying clover plants in the winter, it is obvious that 



