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. Bidwellic. 
(4) The inoculum comes from (a) old fallen mummies, (0) 
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. Bul. 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. Bul. 155: 
142. 1909. 
Scribner, F. L., and Viala, P. Black rot (Lestadia Bidwellii). U.S. 
Agr. Dept. Bot. Div. Veg. Path. Sec. Bul. 7: 1-29. 1888. 
Reddick, D., and Wilson, C. S. The black rot of the grape, and its 
control. Cornell Univ. Agr. Exp. Sta. Bul. 253 : 367-388. 1908. 
Wilson, C. S., and Reddick, D. The black rot of the grape andits 
control. Cornell Univ. Agr. Exp. Sta. Bul. 266: 391-411. 1909. 
Edson, A.W. The black rot of grapes in North Carolina and its treat- 
ment. North Carolina Agr. Exp. Sta. Bul. 185: 133-156. 1903. 
