10 SPRAYING PEACHES, 
ineffective by breaking the sprayed skin of the fruit, thus exposing 
the flesh to attack. In the treatment of the disease it is, therefore, 
important to combine an insecticide with the fungicide so as to destroy 
the beetles. 
TREATMENT. 
Experiments conducted by the Bureau of Plant Industry during 
the past four years have shown conclusively that this disease can be 
controlled by the use of self-boiled lime-sulphur mixture.! 
A schedule of applications for the combined treatment of brown- 
rot, scab, and curculio is given on pages 38—40 of this bulletin. 
PEACH SCAB. 
ECONOMIC IMPORTANCE OF THE DISEASE. 
Of the diseases affecting the fruit of the peach, scab is second only 
to brown-rot in economic importance; in fact, it is more destructive 
Fic. 2.—Peach scab on Elberta peaches, showing spots and cracks caused by the disease. 
than brown-rot in some of the mountain districts. It dwarfs the 
fruit and causes premature dropping, thereby reducing the yield; it 
ruptures the skin, opening the way for brown-rot attacks; and it mars 
the appearance of the fruit, thus lowering the grade and reducing its 
market value. The disease is common wherever peaches are grown 
east of the Rocky Mountains, scarcely an orchard being entirely free 
from it. In some cases, especially in a dry season, only a small per- 
centage of the fruit may become affected and with only a few small 
harmless spots, while in other cases the entire crop may become so 
badly affected as to be unmarketable. If the loss in the orchard 
1 Circulars 1 and 27 and Bulletin 174, Bureau of Plant Industry, U. S. Dept. of Agriculture. 
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