Potato Failures. 
25 
Results. —1. Diseased seed treated with corrosive sublimate gave a loss 
of 20%. 
2. Seed free from the sclerotia stage, out more or less covered with the 
rhizoctonia stage gave a loss of 9%. The tubers were larger and of a better 
quality. 
TABLE IV., SHOWING RESULT OF EXPERIMENT NO. IV. 
Plat Number 
TREATMENT. 
Number Pounds 
of Seed Tubers 
Planted 
Total Number of 
Pounds of Tubers 
Harvested 
Yield in Pounds 
for every Pound of 
Seed Tubers 
Planted 
Loss 
Yield in Sacks 
per Acre 
I 
Check_ 
506 
11553 
23 
137 
II. 
Seed Treated with 1 oz. Corrosive Sublimate to 8 
gallons of water. _ .. 
600 
11161 
1814 
20$ 
111 
III. 
Washed and all tubers containing sclerotia rejected 
504 
10574 
21 
6$ 
126 
Experiment V —The experiments in the following table were conducted 
by E. R. Bliss in 1902. They were made on old potato ground, but the field had 
been in alfalfa during the previous two years, and a fair crop of alfalfa was 
plowed under in the spring before planting. The seed was treated with for¬ 
malin on May 20 and planted about May 24. The rows compared were of 
the same length, and the cultivation and irrigation in all the experiments 
were the same. A sack of tubers in these experiments is estimated at 100 
pounds. 
Lot 1, Plat I Check —Sixty pounds to the row of Prolific seed from the 
Divide were used in this plat. The soil in this plat was slightly better than 
that of the treated seed plat; otherwise the conditions were the same; only a 
few deceased plants were observed in this plat. This plat gave a return of 
26 pounds of tubers for every pound of seed planted, a yield of 158 sacks per 
acre. 
Plat II —Sixty pounds to the row of Prolific Divide seed were use in 
this plat. It was dipped in sacks in a solution of eight ounces of 
formalin to fifteen gallons of water for two hours. No diseased plants 
were observed in this plat and the crop of tubers was clean and 
smooth. Twenty-four pounds of seed were harvested for every pound of seed 
planted, making a return of 144 sacks per acre—a loss of 10%. 
Lot II. Plat I Check —Fifty pounds to the row of Pearl first year’s Wis¬ 
consin seed were used in this plat. It was planted May 30th. The soil, cul¬ 
tivations and irrigations were as nearly the same in these plats as it was 
possible to have them. Thirty-three pounds of tubers were harvested for 
every pound of seed planted—a return of 199 sacks per acre. 
Plat II —Fifty pounds to the row of first year’s Wisconsin Pearl 
were planted in this plat, which had been treated in sacks wuth 
a solution of eight ounces of formalin to sixteen gallons of water for 
two hours. One thousand two hundred pounds of this seed were planted on 
May 24th, and the remaining 2,640 pounds on May 26th. No diseased plants 
were observed in this plat and the tubers were clean, smooth and free from 
disease. One pound of seed gave a return of 30 pounds of tubers—a yield of 
179 sacks per acre, making a loss of 10%. 
Lot III. Plat I Check —Forty pounds to the row of second year Wis¬ 
consin Pearl seed were used in this plat. There were some deceased 
plants observed in this plat, but on the whole the plants were strong and 
vigorous. One pound of seed gave a return of 25 pounds of tubers—a yield 
of about 150 sacks per acre. 
Plat II —Forty pounds to the row of second year Wisconsin Pearl seed 
were used in this lot. It was treated in sacks with a solution of eight ounces 
