108 MANUAL OF FRUIT DISEASES 



like apple-scab. If the schedule advised for the control of 

 scab (see page 12) is rigidly followed, satisfactory results so far 

 as sooty-blotch and fly-speck are concerned will be obtained. 

 Particular attention should be given to the treatments in July 

 and August. 



REFERENCES 



Sturgis, W. C. On the cause and prevention of a fungous disease of 

 the apple. Connecticut Agr. Exp. Sta. Kept. 21 : 171-175. 1898. 



Clinton, G. P. Fly speck, Leptothyrium pomi (Mont, and Fr.) Sacc. 

 Sooty blotch, Phyllachora pomigena (Schw.) Sacc. Connecticut 

 Agr. Exp. Sta. Kept. 1903 : 299-300 ; 302. 1903. 



Selby, A. D. Some diseases of orchard and garden fruits. Sooty 

 fungus and fly-speck fungus an old enemy in a wet season. 

 Ohio Agr. Exp. Sta. Bui. 79 : 133-134. 1897. 



Salmon, E. S. Sooty blotch : a new fungous disease of apples. Gard. 

 Chron. 3 : 48 : 443. 1910. 



Salmon, E. S. Sooty blotch : a new fungous disease of apples. South- 

 eastern Agr. Col. (Wye) Kept, on Econ. Myc. 1909-1910 : 29-32. 

 1910. 



Macoun, W. T. Report of the horticulturist. Sooty or fly-speck 

 fungus. Canada Exp. Farms Rept. 1906 : 123-124. 1907. 



Quaintance, A. L., and Scott, W. M. The more important insect and 

 fungous enemies of the fruit and foliage of the apple. Sooty 

 fungus and flyspeck. U. S. Agr. Dept. Farmers' bul. 492 : 36-37. 

 1912. 



CROWN-GALL 

 Caused by Bacterium tumefaciens E. F. Smith and Townsend 



This disease, known as crown-gall, crown-knot, hairy-root, 

 woolly-knot, woolly-root and root-gall, affects more particularly 

 nursery stock. It is said that the Ben Davis, Early Harvest, 

 Yellow Transparent, Wealthy, Grimes, Northern Spy, Olden- 

 burg, Wolf River, Red June, Gano and Rome Beauty are most 

 susceptible. 



Although crown-gall has been known in Europe for many 

 years, it is the belief of certain authorities that the pathogene is 

 native to this country. American nurserymen have known it 



