APPLE DISEASES 117 



based on experiments made in the above-named region where 

 the weather conditions are somewhat unusual, should serve as a 

 guide in other localities. Doubtless it will be found desirable 

 to vary the schedule tabulated above to suit the conditions 

 obtaining in those apple districts where it becomes necessary 

 to give attention to the control of apple powdery-mildew. 



REFERENCES 



Ballard, W. S. Apple powdery mildew and its control in the Pajaro 



Valley. U. S. Agr. Dept. Bui. 120 : 1-26. 1914. 

 Stewart, V. B. Some important leaf diseases of nursery stock. Apple 



powdery mildew. Cornell Univ. Agr. Exp. Sta. Bui. 358 : 181- 



184. 1915. 

 Galloway, B. T. Experiments in the treatment of pear leaf -blight and 



the apple powdery mildew. U. S. Agr. Dept. Veg. Path. Sec. 



Circ. 8:5-11. 1889. 

 Jackson, H. S. Apple diseases. Powdery mildew. Oregon Crop 



Pest and Hort. Bienn. Kept. 1911-1912 : 236-238. 1913. 

 Pammel, L. H. Powdery mildew of the apple. Iowa Acad. Sci. 



Proc. 1899 : 177-182. 1900. 

 Grout, A. J. A little-known mildew of the apple. Bui. Torr. Bot. 



Club, 26 : 373-375. 1899. 



PlNK-ROT 



Caused by Cephalothecium roseum (Fries) Cda. 



This is a disease which assumed greatest importance when the 

 practice of piling and sweating apples was in vogue. At pres- 

 ent this method of handling the fruit is not in use, consequently 

 pink-rot gives markedly less trouble. In seasons of unusual 

 dampness outbreaks have resulted in heavy losses. The years 

 1882, 1894 and 1902 stand out in the history of the apple 

 industry in western New York because of the epiphytotics of 

 pink-rot. Authorities estimate that thousands of barrels of 

 apples were destroyed in one year in New York State on account 

 of pink-rot. Experiences have been similar in Ohio, Michigan 



