04 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
what inferior to the adjacent sprayed rows, but there was no 
marked contrast. Apparently, there was no blight of any im- 
portance. 
The items of expense for spraying 972 acres of potatoes four 
times were as follows: 
108. ! Ibs. copper sulphate -@ -7€ so 6. vin. was wie o's bp on sree oe $7.56 
P35. Sy Lbs Flittiey oe, ccc. sso kos cobcprce le dale GOR a ee Ga Ca et 2.00 
334. days’ labor for. horsey oe. V7 2. ee ee ee 4.00 
72 days. labor. for’ mans.) S21 UUeC Ls Bae ae eee 9.50 
Weartonisptayer 4012 io. 5). ee De ee eee » aes 4.00 

OCA Te widen ecka = 9.9 + ouceey Sop aepae 48 eikciak ccci aes out tee $27.06 
The total expense of spraying was $2.85 per acre or 71 cents 
per acre for each application. 
The test rows were dug with a potato digger on October 16. 
In both tests the rows were 825 feet long by 3 feet wide, 17.6 rows 
being required to make an acre. For want of time the ‘potatoes 
were not sorted. Accordingly, the yields given are total yields. 
Inasmuch as there are usually more small potatoes on the un- 
sprayed rows it is safe to assume in this experiment that the 
difference in yield of marketable tubers was as great, at least, as 
the difference in total yield. The yields were as follows: 
West test— Second sprayed row on the east, 710 lbs. 
Second sprayed row on the west, 717 lbs. 
Average of middle two unsprayed rows, 666% Ibs. 
Yield, sprayed, 209 bu. 17 Ibs. per acre. 
Yield, unsprayed, 195 bu. 30 lbs. per acre. 
Gain, 13 bu. 47 lbs. per acre. 
East test— Second sprayed row on the east,-726 lbs. 
Second sprayed row on the west, 646 lbs. 
Average of middle two unsprayed rows, 600% Ibs. 
Yield, sprayed, 201 bu. 14 lbs. per acre. 
Yield, unsprayed, 176 bu. 9 lbs. per acre. 
Gain, 25 bu. 5 lbs. per acre. 
There was no loss from rot in either test. 
In the east test the rows on the east side of the unsprayed 
strip were sprayed with soda bordeaux while those on the west 
side were sprayed with lime bordeaux. It appears that the tows 
sprayed with soda bordeaux outyielded those sprayed with lime 
bordeaux at the rate of 23 bu. 28 lbs. per acre. So. far as we 
can learn the test was a fair one except that a greater amount 
