PLATE 58 
Citrus-canker spots on twigs from plants in the isolation field, inoculated on Sep¬ 
tember 16, 1917. These first appeared on April 2, 1918. Photographed on May 2, 
1918. 
A. —Citrandarin (CPB 40175A). 
B. —Poncirus trifoliaia (seedling, Alabama). 
C. —Savage citrange (CPB 7961). 
D. —Rusk citrange / CPB 7956A). 
