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. Bul. 120: 1-26. 1914. 
Stewart, V.B. Some important leaf diseases of nursery stock. Apple 
powdery mildew. Cornell Univ. Agr. Exp. Sta. Bul. 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. 
Cire. 8: 5-11. 1889. 
Jackson, H. S. Apple diseases. Powdery mildew. Oregon Crop 
Pest and Hort. Bienn. Rept. 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. Bul. Torr. Bot. 
Club, 26 : 373-375. 1899. 
Pinx-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 
