13 FARMERS’ BULLETIN 163. 
coat of whitewash (fig. 13) should then be applied. In cases of 
serious infestation it may be necessary to apply as many as three 
% 
bs 
By 
ote 
ya 
a: 
Fig. 13.—Peach trees treated with whitewash to combat the fruit-tree barkbeetle. 
(Original.) 
coats of the whitewash during the season—one early in the spring, 
another about the middle of summer, and a third in the fall. If 
