PLATE 19. 



Bacterial black spot of the plum. 



Spots about six weeks old, except a very few on the Iwo right-hand plums of the upper row. Fruits about one-half grown ; collected 

 July 24. 1902, from an orchard of Japanese plums in central Michigan. In this stage the plums (var. Hale) begin to crack open 

 and are attacked occasionally by fungi t Monilia, etc.). Some tufts of Monilia may be seen on the outer, left-hand fruit, second 

 row from the bottom. Early itages of this disease are shown in figs. 70, 7 I , and 72. 



