Plate I. 



1 







»*. 



CITRUS CANKER ON GRAPEFRUIT LEAVES. 



1. Canker on upper surface of grapefruit leaf. 2. Lower side of the same leaf. 



3. Canker on lower surface of grapefruit leaf along scratch made by a thorn. 



4. Upper surface of same leaf. 5. Young canker on lower surface of grapefruit 

 leaf. All natural size. Collected in South Dade County, Florida. (Courtesy of 

 Florida Plant Board.) 



