New Yoek Agricultural Experiment Station. 243 



THE JAMESPORT EXPERIMENT. 



Conducted by Henry A. Hallock, Jamesport, Long Island. 

 Fifteen acres of potatoes were sprayed five times between June 9 

 and July 29. The sprayer used was a two-liorse, four-row " Iron 

 Age " sprayer, carrying one nozzle per row. The bordeaux was 

 made by the 7-4-50 formula. Four unsprayed rows were left for 

 a check. Four rows adjoining the check on one side were double- 

 sprayed. There being no bugs it was unnecessary to apply 

 poison to the check rows, but, on the sprayed portion of the field, 

 arsenite of soda was used with the bordeaux twice at the rate of 

 four quarts of the stock solution to 50 gallons of bordeaux for the 

 control of flea beetles which were fairly plentiful. There was 

 no late blight and only traces of early blight. At no time during 

 the season was there any marked difference between sprayed rows 

 and the check. 



The items of expense were as follows: 



1200 lbs. copper sulphate @ 5^4 cts $63 00 



600 lbs. lime 4 00 



200 lbs. sal soda @ 1 ct 2 00 



100 lbs. white arsenic @ 5 cts 6 00 



50 hrs. labor for man @ 20 cts 10 00 



50 hrs. labor for team @ 45 cts 22 50 



Wear on sprayer 5 00 



Total $111 50 



Expense of spraying one acre once, $1.48. 



Expense of spraying one acre five times, $7.40. 



The test rows (variety Green Mountain) yielded as follows: 



Two double-sprayed rows, 1,261 lbs.=: 221.1 bu. per acre. 



Two single-sprayed rows, 1,150 Ibs.^ 201.6 bu. per acre. 



Two check rows, 1,100 lbs.= 192.9 bu. per acre. 



Gain from double-spraying, 28.2 bu. per acre. 



Gain from single-spraying, 8.7 bu. per acre. 



With potatoes at 90 cts. per bushel single-spraying resulted in 

 a net profit of 43 cts. per acre, while double-spraying gave a net 

 profit of $10.58. 



