New YorK: AGRICULTURAL EXPERIMENT STATION. 209 - 
potatoes were of the variety Rural New Yorker No. 2. They 
were planted May 28, 15 inches apart in the row. Each row re- 
ceived ten pounds of commercial fertilizer applied by hand as uni- 
formly as possible in the furrows before planting. For some 
reason not well understood Rows 18 to 20 inclusive did not come 
up as well as they should. However, there was a fair stand of 
plants. 
The 20 rows were divided into four series of five rows each 
as follows: 
Series I. Rows 1, 5, 9, 18, 17. Check. Not sprayed. Bugs 
hand picked. 
Series II. Rows 2, 6, 10, 14, 18. Sprayed 4 times, arsenite of 
soda in lime water. 
Series IIT. Rows 3, 7, 11, 15,19. Sprayed 4 times with arsenite 
| of soda in bordeaux and once with bordeaux alone. 
Series IV. Rows 4, 8, 12, 16, 20. Sprayed 5 times with bordeaux 
alone. Bugs hand picked. 
The rows of Series I received no insecticide or fungicide of any 
kind. Bugs were removed by hand picking as in the experiment 
with paris green. 
The stock solution of arsenite of soda was prepared by the Ked- 
zie formula given on page 199. In different sprayings the quanti- 
ty used varied from 2 to 4 pints in 50 gallons. When used with 
lime water (Series I1) two pounds of quicklime was added for 
each pint of the arsenite-of-soda solution. As in the paris green 
experiment, the spraying was done thoroughly, and uniformly 
with a knapsack sprayer. 
FIRST SPRAYING. 
The first spraying was made on July 7 and 8 when the plants 
were 6 to 8 inches high.** The rows of Series [I were’ sprayed 
with the following mixture: —4 pints stock solution of arsenite 
of soda, 8 pounds quicklime and 50 gallons water. The lime was 
slaked slowly as for whitewash and afterward diluted to 50 
gallons. The arsenite-of-soda stock solution was then added and 
after thorough stirring spraying was begun at once. 
— 
*8 Series IV on July 7, the other three series on July 8. 
14 
