168 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
weeks.” The items of expense for spraying six acres six times 
were as follows: 
310 ‘lbs, copper sulphate (@*s34c-, 2 +e bt ts ek ee ee $17.82 
32.“ paris) green '(@15t4e) ce). Se ee ee ee 4.96 
Freight on copper sulphate and paris green..............-.....0. .52 
Limes. Vic se ee FOes a Pe eames One ROTEL ee Te 1.40 
78 hrs. labor for mani@ T2iec.ns. > de ee eee Pee 9.75 
58 «" elabor stor*horses(@) 0c...) «sa. e ee ee ee eee 5.80 
Wear-on sprayer (10 per cent of cost) 6s. oss. ose ee ee 1.60 
DOtal es eatin ox eae ee al Be en eee $41.85 
Experiment No. 2.—Report obtained through the courtesy of 
Prof. J. L. Stone of the Cornell University Experiment Station. 
The potatoes in this experiment were planted very late—July 3 and 
5—following a crop of peas grown for the canning factory. 
Experiment No, 3.—The test rows were dug and measured in 
the presence of Prof. J. L. Stone through whose courtesy we are 
able to publish the retsults. The potatoes were sprayed six times, 
but in five of these times the plants were gone over twice so that 
in reality the number of sprayings was eleven. At digging time 
the sprayed rows showed rot to the amount of 24 bu. Io lbs. per 
acre while on the unsprayed rows it was only 6 bu. 56 lbs. per acre. 
Concerning this, Prof. Stone writes as follows: “As Mr. Cheney 
states, it seemed that there were fewer diseased potatoes in the 
unsprayed area because the decay had gone on so repidly that 
most of the diseased potatoes had disappeared or at least remained 
only as shriveled skins.” Mr. Cheney has made a practice of spray- 
ing his potatoes during the past twelve years. 
Experiment No. 4.—Spraying reduced the loss from rot. 
Experiment No. 5.—The dates of spraying were July Io, 17, 
August 5 and 19. Bordeaux of the 6-6-50 formula was applied 
at the rate of 50 gallons per acre in the first three sprayings and 
75 gallons per acre in the last one. Paris green at the rate of one 
pound per acre was applied with the bordeaux in the first two 
sprayings. On the same dates the unsprayed rows were treated 
with paris green in water. The unsprayed rows were free from 
rotten tubers while on the sprayed rows the loss from rot was at 
the rate of 25 bushels per acre. 
