208 
sulphate and 2 pounds of lime, and it will be seen that the yield per 
vine is 2.10 pounds. In section 10, treated in exactly the same way, 
with the addition of one winter spraying with the simple solution of 
sulphate of copper, the yield is 3.21 pounds, a gain of more than a pound 
per vine. This certainly indicates that the winter treatment in this 
case resulted beneficially, but whether the same will hold true every¬ 
where we are not prepared to say. Assuming that it does, however, let 
us, on the basis of the figures here given, estimate the cost of treating 
an acre of vines and compare the yield with that of an acre not treated. 
Let us suppose that A owns a vineyard of 1 acre and that his neigh¬ 
bor, B, is the possessor of a similar number of vines of the same variety. 
A treats his vineyard six times, as follows: 
March 20, sprayed with a simple solution of sulphate of copper, 1 
pouud to 25 gallons, at a total cost of 65 cents. May 18,June 7, July 
23, August 5, and August 16, sprayed with the Bordeaux mixture, con¬ 
taining 6 pounds of sulphate of copper, 4 pounds of lime to 22 gallons 
of water, at a total cost of $6.70, which, upon adding the 65 cents for 
first spraying, becomes $7.35. 
B makes no treatment whatever, consequently saves the $7.35. A’s 
vineyard of 500 vines yields 3J pounds per vine, or 1,750 pounds for the 
whole, which, at 3 cents per pound, equals $52.50. 
B’s vineyard yields 500 pounds, or 1 pound per vine, valued at 3 cents 
per pound, or, for the whole, $15. Summing up the results we have 
the following: 
A. 
By treatment of vineyard. $7. 35 
Yield of grapes, 1,750 pounds, at 3 cents per pound .. 52. 50 
Balance. 45.15 
B. 
No treatment. 
Yield of grapes, 500 pounds, at 3 cents per pound. 15. 01 
Difference in favor of A.. 30.15 
Turning again to the table we notice that section 2, treated with eau 
celeste containing 1 pound of copper sulphate and 1J pints of ammonia 
to 22 gallons of water, yielded 3.22 pounds per vine. This is indeed a 
very good showing, but as this preparation, unless used with extreme 
caution, is certain to burn the foliage its use can not be advised. 
The conclusions which we draw from the foregoing maybe briefly 
summed up as follows : 
(1) It pays to treat the vines for black-rot. 
(2) The best preventive, all things considered, is the Bordeaux mix¬ 
ture, containing 6 pounds of copper sulphate, 4 pounds of lime to 22 
gallons of water. 
