144 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
were sprayed five times — July 11, 20, August 4, 18 and September 
2. The sprayer used was an Aspinwall one-horse, four-row power 
sprayer carrying one nozzle per row in the first spraying and two 
nozzles per row in the other four. (Plate IV, fig. 1.) The 
bordeaux was made by the 6-6-50 formula and the water used in 
its preparation was obtained from a well at one corner of the field. 
One man pumped the water and made the bordeaux while another 
drove the sprayer. Paris green was used with the bordeaux only 
in the first two sprayings at the rate of one pound to 50 gallons. 
In 1904 a part of the field was in sod and the remainder grew 
corn. On each kind of ground four rows 525 feet long were left 
unsprayed. The unsprayed rows were treated twice with paris 
green in water at the same rate and on the same dates as the 
sprayed rows. Also, the application was made with the same 
sprayer. Bugs caused no material injury anywhere. Late blight 
was the principal enemy in this experiment. The unsprayed rows 
blighted much more than the sprayed rows although the latter were 
considerably injured. Toward the close of the season there was a 
marked contrast between the sprayed and unsprayed rows. Even at 
digging time (October 6) it was noticeable that the stalks of the 
unsprayed plants had been dead longer and were much drier than 
those on the sprayed rows. 
The items of expense for spraying eleven acres five times were 
as follows: 
BI TUS LCOPPErPSULD MATE ICD 9a. bee colon toi fee hee oly e eee eee ee $22.19 
S eH lithen(@) <15C00 eine tee ae i ar eee ee 75 
32 [bs."paris: green -@). 2060 ce es Vs Pa ee ee 6.40 
70 irs labor for ‘mat t(@=15e!: oye 21 BER, LEER ee Coe 11.70 
34°-" Jabor for: horse (@iic hay .s ee ee ee ee eee 3.40 
Wears on: sprayer. (sy cacnee etic ears tein ed Pee ke 3.00 
Total 2 22G eet pede ke ee eee Se fate a Se soba inate $47.44 
The total cost of spraying was $4.31 per acre or 86 cents per 
acre for each application. 
Both sets of test rows were dug with a potato digger on October 
6. The yields were as follows: 
Test No. 1. Corn ground. 
Second sprayed row on the north, 193% lbs. marketable tubers. 
Second sprayed row on the south, 198 lbs. marketable tubers. 
Average of two sprayed rows, 19554 lbs. marketable tubers. 
