GRAPE DISEASES 253 



REFERENCES ON GRAPE-ANTHRACNOSE 



Shear, C. L. Grape anthracnose in America. Int. Cong. Vit. Kept. 

 1915: 111-117. 1915. 



Hawkins, L. A. Experiments in the control of grape anthracnose. 

 U. S. Agr. Dept. Plant Indus. Bur. Circ. 105 : 1-8. 1913. 



Scribner, F. L. Report on the fungus diseases of the grape vine. 

 Anthracnose. U. S. Agr. Dept. Bot. Div. Bui. 11:34-38. 

 1886. 



Scribner, F. L. Some fungous diseases of the grape. III. Anthrac- 

 nose of the vine and bird's-eye-rot. Tennessee Agr. Exp. Sta. 

 Bui. -4 (no. 4) : 111-112. 1891. 



Scribner, F. Lamson. Anthracnose Sphaceloma ampelinum, DeBy. 

 U. S. Agr. Comm. Rept. 1886 : 112-115. 1887. 



Quaintance, A. L., and Shear, C. L. Insect and fungous enemies of 

 the grape east of the Rocky Mountains. Anthracnose. U. S. 

 Agr. Dept. Farmers' Bui. 284 : 34-35. 1901. 



Lodeman, E. G. Some grape troubles of western New York. An- 

 thracnose. Cornell Univ. Agr. Exp. Sta. Bui. 76 : 442-443. 1894. 



Rainford, E. H. Treatment of anthracnose, with a comparison of the 

 effects of various sprays and dressings. Queensland Agr. Jour. 7 : 

 529-532. 1900. 



CROWN-GALL 



Caused by Bacterium tumefaciens E. F. Smith and Townsend 



This is the same disease which occurs on the peach, apple and 

 other plants, a list of which appears on page 108. It is called 

 crown-gall, crown-knot, root-tumor and black-knot (Fig. 66). 

 Certain varieties are found to be more susceptible to the disease 

 than others. In many localities the growing of varieties of 

 grapes susceptible to crown-gall has become unprofitable. Sus- 

 ceptibility is believed by certain authorities to vary with the 

 susceptibility to frost-injury; others hold that sap-acidity is 

 a factor in determining susceptibility. Among the kinds 

 resistant to crown-gall may be noted : Concord, Catawba, 

 Delaware and other American varieties. European grapes 

 are more susceptible, and some of these, arranged in 



