PEACH DISEASES 277 



Humphries, J. E. On Monilia fructigena. Bot. Gaz. 18 : 85-93. 1893. 

 Cooley, J. S. A study of the physiological relations of Sclerotinia 



cinerea (Bon.) Schroter. Missouri Bot. Gard. Annals, 1 : 291-323 



1914. ' 

 Scott, W. M., and Quaintance, A. L. Spraying peaches for the control 



of brown-rot, scab, and curculio. U. S. Agr. Dept. Farmers' Bui. 



440 : 5-40. 1911. 

 Scott, W. M., and Quaintance, A. L. Control of the brown-rot and 



plum curculio on peaches. U. S. Agr. Dept. Ent. Bur. Circ. 120: 



5-7. 1910. 

 Scott, W. M., and Ayers, W. T. The control of the peach brown-rot. 



Georgia State Bd. Ent. Bui. 30 : 96-104. (Georgia State Hort. 



Soc. Proc. 33 : 96-104.) 1909. 



LEAF-CURL 



Caused by Exoascus deformans (Berk.) Fckl. 



It is evident that this disease has long been associated with 

 the peach, this fruit-tree being a natural host for the causal 

 organism. Furthermore the disease is distinctly one affecting 

 the peach and its derivatives, such as the nectarine and peach- 

 almond. It has rarely been found on other fruits. This 

 trouble, known as peach leaf-curl, curl, curly-leaf and leaf- 

 blister, affects both orchard trees and nursery stock, certain 

 varieties showing more resistance than others. The Elberta 

 and Carman are the most susceptible in New York State, while, 

 in the nursery at least, the Richards is resistant. Seedling 

 peaches show marked susceptibility, which fact indicates that 

 the disease may have originated with the wild peach in central 

 China. 



The disease has long been known in England, where it was 

 described as early as 1821 by an English gardener as blister. 

 It has become widely distributed throughout the world wherever 

 peaches are grown, being most serious near the seacoast or in 

 the region of large interior lakes. In the United States and 

 Canada it is very common and destructive in the peach-grow- 

 ing sections about the Great Lakes. Likewise in the Pacific 



