68 
per cent more fruit free from spot than the adjoining untreated tree and 
39.9 per cent more fruit than the average of eighteen untreated trees. 
(h) Trees treated with potassium sulphide gave 23.67 per cent less 
fruit free from spot than the adjoining untreated tree and 9.87 per cent 
less than the average of eighteen untreated trees. 
CONCLUSIONS. 
The following conclusions may be fairly drawn from the experiment: 
(1) Five treatments gave a larger percentage of fair fruit than three 
when Bordeaux and copper acetate were used, but there was no ad- 
vantage in the case of the other fungicides. 
(2) The three most effective fungicides used were Bordeaux mixture, 
copper acetate, and the copper carbonate and glue mixture. The cop- 
per sulphate added to carbonate of soda forms copper corbonate. Of 
the three the Bordeaux mixture is to be preferred when all things are 
taken into consideration. 
(3) The amount of spot was actually greater upon trees treated with 
chloride of lime and potassium sulphide than upon the untreated. This 
excess of spot increased regularly with the concentration of the solu- 
tion of chloride of lime. Whether this chemical actually favors the 
growth of the fungus, as would appear from the above variation, must 
be determined by more extended experiments. 
SPRAYING FOR FUNGOUS DISEASES OF THE GRAPE, 
A PROFITABLE INVESTMENT. 
Early in the spring of 1891 a bulletin* giving a brief account of sev- 
eral of the most destructive grape diseases and methods of combating 
the same was published by the Division of Vegetable Pathology. 
Twelve thousand copies were distributed among the grape-growers of 
the country, with a request that they give the remedies recommended 
therein a thorough trial and report the results at the close of the sea- 
son. The main object of this request was to obtain some definite in- 
formation as to the actual value in dollars and cents of the suggestions 
made by the Department. With this end in view there was sent in 
midsummer to 5,000 of the principal grape-growers to whom the bulle- 
tin above mentioned had been forwarded a copy of the following cir- 
cular: 
U. S. DEPARTMENT OF AGRICULTURE. 
DIVISION OF VEGETABLE PATHOLOGY. 
DEAR Sir: With a view of obtaining more definite information in regard to the 
losses occasioned in your section by black-rot, downy mildew, and anthracnose of the ° 
grape, as well as to get some reliable data as to the extent the various fungicides 
* Farmers’ Bulletin No. 4, ‘‘Fungous Diseases of the Grape.” 
