PLATE 50 
Plates 50-53 illustrate the results of Citrus-canker inoculations in the greenhouse, 
showing the characteristic type and number of spots on the various plants. The 
spots are all representative of the particular host, approximately the same age and 
natural size. 
A. —Citrus Medica, citron of commerce (CPB 7768); 
B. —Citrus grandis, grapefruit (CPB 11170); 
C. —Thornton tangelo (CPB L-715 A); 
D. —Citrus sp., limon real 18 (CPB 7819). 
(358) 
