Bui. 252, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate V. 



Pomelo Leaves, Showing (1) Development of Colonies of Glomerella cincu- 

 lata in Moist Chamber and Apparent Localization of Numerous Points of 

 Infection; (2) the Small Leaf One Year Younger, from Same Plant Treated 

 in the Same Manner, Apparently not Infected. 



