148 Report oF THE BorTaNicaAL DEPARTMENT OF THE 
between the sprayed and unsprayed rows, but the contrast was 
not aS marked as in the other field. Here, there was much 
blight among the sprayed plants as wel as the unsprayed. 
In both fields the unsprayed rows were thoroughly treated four 
times with paris green by means of a powder gun so there 
was no damage by bugs. There was only a little rot, but there 
seemed to be quite as much on the sprayed rows as on those 
unspraved. Price of potatoes, 45 cents. 
EXPERIMENT NO. 6. 
Conducted by ©. W. Dusen, Gainesville. In a field of fifteen 
acres of potatoes, variety White Giant, different portions were 
sprayed two, three, four and five times respectively, and four rows 
80 rods long, 382 inches apart, left unsprayed. The spraying was 
done with an outfit similar to the one used in Experiment 
No. 5. | 
The yields were as follows: 
Four rows not sprayed, 4314 bu. or 134 bu. 31 Ibs. per acre. 
Four rows sprayed twice, 56 bu. or 173 bu. 11 lbs. per acre. 
Four rows sprayed three times, 68 bu. or 210 bu. 17 Ibs. per acre. 
Four rows sprayed four times, 78 bu. or 241 bu. 18 lbs. per acre. 
Four rows sprayed five times, 92 bu. or 284 bu. 31 Ibs. per acre. 
The difference of 38 2-3 bushels per acre between unsprayed 
rows and rows sprayed twice may be fairly considered due to 
spraying ‘since the twice-sprayed rows were adjacent to the un- 
sprayed rows; Jikewise, the gain of 75 bushels 46 pounds per acre 
in favor of three sprayings may be justly attributed to the spray- 
ing since these rows adjoined the unsprayed rows on the other 
side. But the rows sprayed four times were at considerable dis- 
tance from the unsprayed rows and so cannot be closely com- 
pared with them. Neither can the five-sprayed rows, for they 
were still farther away and on soil which had been fertilized more 
heavily. However, it is probable that the greater part of the 
large increase in yield on these rows is due to the spraying. 
Market price of potatoes at digging time, 45 cents per bushel. 
; EXPERIMENT .NO. 7. 
Conducted by L. H. Taylor, Hardys, Wyoming County. Five 
acres of potatoes, Carman No. 3, sprayed four times with an 
Empire King barrel spray pump mounted on a two-wheeled, one- 
