TREATMENT OF -PLANT DISEASES. 
By B. T. GALLoway. 
INTRODUCTION. 
The work set forth in the accompanying pages was conducted in 
the vicinity of Washington, D. C., Geneva, N. Y., and Ithaca, Wis. 
In order that as many of the experiments as possible might at all times 
be under personal supervision, the work was confined for the most part to 
the vicinity of Washington, such localities as offered the best means of 
obtaining the desired information being selected in every case. Thus 
for the work on pear and peach diseases orchards on the Delaware 
peninsula were chosen. Work on grape diseases was carried on at 
Sterling, Va., a region peculiarly adapted to the culture of this fruit, 
but now in bad repute on account of black rot and other maladies. 
The nursery work was divided between Franklin Davis’s place, at Mul- 
likin, Md., and Geneva, N. Y. Apple scab was also under investiga- 
tion in New York, but the work on this disease was for the main part 
confined to Wisconsin. The Wisconsin experiments were in charge of 
Prof. E. S. Goff, while the New York work was placed in the hands of 
Mr. D. G. Fairchild, an assistant in the Division. The entire field- 
work near Washington, including the preparation and application of 
fungicides, was conducted by Mr. P. H. Dorsett, a special agent of the 
Division. In making critical notes on the work Mr. W. T. Swingle 
rendered valuable assistance, while Mr. Fairchild assisted in the prep- 
aration of the formule for fungicides. 
EXPERIMENTS IN THE TREATMENT OF THE BLACK ROT OF THE GRAPE, 
For this work a vineyard at Sterling, Va., 30 miles southwest of Wash- 
ington, was selected. Experiments in the treatment of other vine 
diseases were also made by a number of agents in different parts of the 
country. In this paper, however, we shall give the results of the work 
in Virginia only, it being for the most part along new lines, while the 
others were largely confirmatory of previous investigations, 
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