PLATE A» 



Young maize plant, showing the effects of a very early attack of the downy mildew 

 on a small, early maturing variety, Manobo Yellow. Notice the dwarfing and the 

 pale appearance of the plant as a whole, the narrowness and stiffness of the leaves, and 

 the narrow striping of the later leaves throughout their length. The plant was 32 days 

 old when photographed and had first shown the disease two weeks after emerging from 

 the soil. One-fourth natural size. 



' In the preparation of Plates A and B the diseased plants were photographed and enlargements were 

 colored to correspond as closely as possible to the living specimens. Prepared by L. S. Weston. 



