170 REPORT OF THE BoTANICAL DEPARTMENT OF THE 
23 bushels, while three sprayed rows on one side yielded 35 bushels 
and three on the other 36 bushels. Mr. Roberts believes that the 
early sprayings are the most important. 
Experiment No. 13.—In addition to five applications of bordeaux 
the plants were treated twice with paris green. The sprayed rows 
outlived the unsprayed ones by three weeks. 
Experiment No, 14.—Ten double sprayings (== 20 single spray- 
ings) were made between June 30 and September 7. The total 
quantity of bordeaux used on 17% acres was 12,980 gallons which 
is at the rate of 742 gallons per acre. Check rows were left in 
three different lots. In Lot No. 1 the gain due to spraying was 
120 bushels per acre; in Lot No. 2 it was 192 bushels per acre; 
and in Lot No. 3, 98 bushels per acre. The average gain was 
13624 bushels per acre. The total yield on 18 acres (17% a. 
sprayed and % a. unsprayed) was 4,825 bushels which is at the 
rate of 268 bushels per acre. 
Experiment No. 15.—Most of the field on both sides of the four 
unsprayed rows was sprayed four times and gave an average yield 
of 100 bushels per acre; but some rows at one side of the field 
were sprayed seven times. These rows yielded at the rate of 123 
bushels per acre. | 
Expervment No. 16.—The total yield on 14% acres was 2,100 
bushels which is at the rate of 145 bushels per acre. This shows 
that the test rows were located in a representative portion of the 
field. 
Experiment No. 17,—The unsprayed rows died two weeks earlier 
than the sprayed ones. Spraying reduced the loss from rot. 
Experiment No. 18.—On the unsprayed rows the loss from rot 
was at the rate of 38% bushels per acre, while on the sprayed 
rows it was 281% bushels per acre. 
Experiment No. 19.—The loss from rot was the same on sprayed 
and unsprayed rows; viz., 21 bushels per acre. This field of five 
acres was the only one in the vicinity of Beaver Dams which was 
sprayed in 1905. 
Experiment No. 20.—The test rows were dug and weighed in the 
presence of a Station representative. 
Experiment No. 21.—The yields given are for unsorted potatoes. 
