DRUPACEOUS FRUITS 125 



spraying the peach orchard where the brown rot and scab 

 are troublesome, but many disappointments are naturally 

 to be expected. The curculio and other insects readily 

 break the skin of the peach and admit the brown-rot fungus 

 even through a coating of the spray mixture, so that a cer- 

 tain amount of rot may always be expected when the condi- 

 tions are favorable." 



Scab (Cladosporium carpophilum. Thuem.). — This disease, 

 which is widespread and so common that many people regard 



Fig. 56. — Peach scab. Original. 



it as an integral part of the peach, may consist of isolated, 

 sooty, black specks, or of black specks so numerous as to 

 coalesce into large blotches. These sometimes cover as 

 much as one third or one half of the peach. The side which 

 is attacked is dwarfed, often cracked, and the flesh adjacent 

 to the diseased part is bitter and green, even after the normal 

 portions are ripe. 



The disease develops in most serious form during rainy 

 seasons, and is worse upon some varieties than upon others. 

 It is especially bad upon Hill's Chili. It is reported from 

 Missouri to have done damage equal to 70 per cent of the 



