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ie 
New YorK AGRICULTURAL EXPERIMENT STATION. 87 
A four-row check was left in the variety White Carlisle. 
These rows were kept free from “bugs” by three applications - 
of paris green in water. 
In this experiment there was no trouble of any kind except 
a severe attack of late blight, Phytophthora infestans, which began 
to appear On the unsprayed rows the latter part of July and 
during August became very destructive. Even the sprayed por- 
tion of the field was considerably injured. Just why the spraying 
was not more effective is not clear. However, the spraying 
proved profitable. 
The items of expense for spraying thirteen acres of potatoes 
five times were as follows: 
s7asipsacoppen sulphate @ 6¢ vis. oi. ).ch eo cc cee Leva tle hips oe $22.32 
ME ISAC CU MITTS OPS TG os a csi d wrclena. eet » bye Sere «acdidiscage eotee, «hee 5. 35 
ee MIArectisve Of SOA SOIULION. ... on). - cee cc ew eee ee wees ve ueas 1.46 
Seememmaver IOP Man ditd tall (@ $3.0... 2. ws tee eee ce tes 15.00 
noe: FOL ielper (a) Sis fa eat ee el. vo ee IE 5.00 
rea agts 2 aris rv me, tx SN alate, tk wligdaks bleak clo 12.50 
I haar Bed ee ee ae ails otk 'a cle uk 0 big’ tied $61.63 
The total expense of spraying was $4.74 per acre or 95 cents 
per acre for each application. 
The test rows were dug by hand on September 26. Owing to 
a washout across the middle of the field it was necessary to con- 
fine the test to 300 feet at the east end of the rows. The yields 
were as follows: 
South sprayed row, 103 Ibs. marketable tubers. 
North sprayed row, 134 lbs. marketable tubers. 
Average of middle two unsprayed rows, 85 lbs. marketable tubers. 
Yield, sprayed, 103 bu. 9 lbs. marketable tubers per acre. 
Yield, unsprayed, 74 bu. marketable tubers per acre. 
Gain, 29 bu. 9 Ibs. marketable tubers per acre. 
In spite of the severe attack of blight there was no loss from 
rot among the tubers. The yield of small potatoes was at the 
rate of 6 bu. 32 lbs. per acre on the sprayed rows and 4 bu. 21 lbs. 
per acre on’the unsprayed rows. 
On the day the test rows were dug the market price of pota- 
toes in Avoca was 40 cents per bushel. At this price 29 bu. 
9 Ibs. of potatoes would be worth $11.66. Subtracting $4.74, the 
_ expense of spraying, there is left a net profit of $6.92 per acre. 
