Powdery Mildew of Clover 



311 



An examination of table I shows that, among the various species 

 of Trifolium represented, only T. pratense was mildewed. T. incarnatum, 

 T. hyhnchim, and A. repens, all of which are given as hosts for Erysiplie 



Fig. I. Difference in Susceptibility to Mildew. (A and B.) Difference in Two Clovei- 

 Varieties. A. Flat of Tennessee 2138 clover susceptible to mildew. B. Flat of Italian 

 54779 clover resistant to mildew. (A' and B'.) Difference in Two Plants of Variety Ohio 

 2135. A'. Leaf of susceptible plant. B'. Leaf of immune plant. 



Pohjgoni, were absolutely free from mildew. This, therefore, would 

 agree with the results of Salmon as well as the observations of a num- 

 ber of pathologists in this country in 1922 that the mildew of red clover 



