126 



DISEASES OF ECONOMIC PLANTS 



value of the crop, and Selby estimated the loss in one crop in 

 Ohio at from 20 to 50 per cent. 



The beneficial effects of the self-boiled lime-sulphur 



Fig. 57. — Peach leaf curl. After Atkinson. 



treatment, and the method of using it, have been given 

 under peach brown rot. 



Curl {Exoascus deformans (Berk.) Fckl.). — Throughout 

 the peach-producing region this disease abounds, it being 

 particularly injurious in the more moist localities. The 

 annual loss caused by it approximates $3,000,000 in the 

 United States. 



The disease is due to a fungus which grows in the leaves, 

 causing the peculiar malformation which justly gives rise 



