PLATE 22 



A. — View of a rowof Egyptian sorghum showing tall, green, healthy plants at the 

 left and at the right a dwarfed, yellowish white plant which is infected by the downy 

 mildew. 



B. — Near view of this diseased sorghum plant. Notice the slender, stunted habit, 

 the pallor and faint stripings of the leaves. 



C. — A comparative view of healthy teosinte (right), and teosinte seriously infected 

 with the downy mildew (left). The healthy plant has many suckers and is large and 

 vigorous with broad, flexible, dark green leaves and well-developed inflorescences. 

 The diseased plant has no suckers, is stimted and weak, and bears slender, stiff, brittle 

 leaves, which are pale in color and inconspicuously striped, and poorly developed 

 tassels containing a few abortive seeds at the base. 



