vol h u o m 3 evi ’S journal of mycology. I January 6, 1891 
EDITED BY 
THE CHIEF OF DIVISION AND HIS ASSISTANTS. 
CHIEF, 
B. T. GALLOWAY. 
ASSISTANTS, 
Effie A. Southworth. David G. Fairchild. Erwin F. Smith. 
EXPERIMENTS IN THE TREATMENT OF PLANT DISEASES. 
By B. T. Galloway and I). G. Fairchild. 
PART I. 
TREATMENT OF BLACK ROT OF GRAPES. 
The present season a series of experiments was made by the writers 
with a view of determining the value of certain lines of treatment for 
several destructive plant diseases. The results of this work we propose 
to set forth in two or three papers which we hope to get into the hands 
of fruit growers, and others directly interested, before spring. The 
present paper relates to an experiment made in the treatment of black 
rot of the grape, at Vienna, Va., 12 miles southwest of Washington. 
The vineyard is the property of Capt. J. O. Berry and consists of 
1,000 Concord vines sixteen years old trained to stakes 8 feet high. 
The vines had never been treated for rot, in fact they had been prac¬ 
tically abandoned for the past five years on account of this disease. 
This, together with the fact that there had been little done in the way 
of pruning or soil cultivation, offered the very best means of thoroughly 
testing the value of the fungicides. 
In the experiments an endeavor was made to throw some light on the 
following questions: 
I. The best means of applying the preparations. 
II. The relative value of the Bordeaux mixture, ammoniacal copper 
carbonate solution, copper carbonate in suspension, and a mixed treat¬ 
ment consisting of three applications of the Bordeaux mixture followed 
by five of the ammoniacal solution. 
III. The actual cost of each treatment. 
14607 —No. 3-1 8U 
