Bui. 120, U. S. Dept. of Agriculture. 



Plate IV. 



Fig. 1.— Yellow Newtown Apple Twigs. 



Practically the entire bark and leaf surface of most of the twigs is covered with mildew. The 

 badly diseased leaves are long and narrow. Many have died and dropped off. Patches of 

 perithecia are seen at p. Photographed in July, 1911. 



Fig. 2.— Yellow Newtown Flowers and Twigs. 



The cluster of flowers (A) is completely covered with mildew. Photographed April 15, 1913. 

 The twigs (B), similar to those in figure 1, show stunted growth and enlarged diameter of 

 the diseased portion, a and a' are diseased laterals sent out from infected buds after the 

 ends, e, of the previous year's growth had died back. Photographed in July, 1911. 



