236 MANUAL OF FRUIT DISEASES 



(1) The disease is of long-standing the world over and is 

 well known from experience to be destructive. In regions 

 where it occurs practically every year to a greater or less 

 extent, the application of the above scheduled sprayings should 

 not be neglected. 



(2) All parts above the ground are likely to be affected. 

 Spray every part accordingly. Watch for the disease in June. 



(3) The fruit is rotted, the leaves are spotted, and the woody 

 parts are cankered as a result of the action of the mycelium of 

 G. Bidwellii. 



(4) The inoculum comes from (a) old fallen mummies, (b) 

 clingers, (c) tendrils and canes. Get rid of these sources of 

 trouble as far as possible. Destroy mummies by carrying them 

 out at picking time. Plow the vineyard in the spring: this 

 is commendable both as good viticultural practice and in order 

 to bury fallen mummies. It is not believed a profitable prac- 

 tice to collect and burn clingers. Nor are sanitary measures 

 especially applicable to cankered tendrils and canes. The 

 grower must depend upon bordeaux mixture for the protection 

 of these parts. 



REFERENCES 



Reddick, D. The black rot disease of grapes. Cornell Univ. Agr. 



Exp. Sta, Bui. 293 : 289-364. 1911. (Extensive bibliography.) 

 Shear, C. L., and Miles, G. F., and Hawkins, L. A. The control of 



black-rot of the grape. U. S. Agr. Dept. PL Indus. Bur. Bui. 155 : 



1^2. 1909. 

 Scribner, F. L., and Viala, P. Black rot (Lsestadia Bidwellii). U. S. 



Agr. Dept. Bot. Div. Veg. Path. Sec. Bui. 7 : 1-29. 1888. 

 Reddick, D., and Wilson, C. S. The black rot of the grape, and its 



control. Cornell Univ. Agr. Exp. Sta. Bui. 253 : 367-388. 1908. 

 Wilson, C. S., and Reddick, D. The black rot of the grape and its 



control. Cornell Univ. Agr. Exp. Sta. Bui. 266 : 391-411. 1909. 

 Edson, A. W. The black rot of grapes in North Carolina and its treat- 

 ment. North Carolina Agr. Exp. Sta. Bui. 185 : 133-156. 1903. 



