New York Agricultural Experiment Statiox. 241 



the greenwich experiment. 



Conducted bj P. 0. Billings, Greenwich, N. Y. Four and 

 one-half acres of potatoes were double-sprayed four times with a 

 two-horse six-row "Aroostook " sprayer carrying one nozzle per 

 row. At each spraying a portion of the field was double-sprayed 

 so that total amount of work done was equal to spraying 25.8 

 acres once. The last spraying, made September 12, could have 

 been of little or no benefit as the plants were killed by frost on 

 September 14. In different sprayings the strength of the bor- 

 deaux varied from 5-5-50 to 7|-7^-50. The check consisted of 

 three rows 736 feet long by 2.9 feet wide. For the control of 

 bugs paris green, at the rate of one pound to fifty gallons, was 

 applied with the bordeaux in the first three sprayings. The check 

 rows received a single application of paris green yet they were not 

 injured by bugs. On account of a severe drought the plants were 

 much affected with tip burn. Blight and flea beetles were absent. 

 The superior condition of the sprayed rows as compared with the 

 check rows indicated that spraying checked the tip bum very 

 materially. 



The expense account contained the following items : 



99 lbs. copper sulphate @ 6^ cts $6 43 



99 lbs. lime @ 1 ct 99 



10 lbs. paris green @ 20 cts 2 00 



13 hrs. labor for man @ 15 cts 1 95 



10 hrs. labor for team @ 30 cts 3 00 



Wear on sprayer 5 00 



Total $19 37 



Expense of four double-sprayings, $6.40 per acre. 

 The test rows (variety Noxall) yielded as follows: 

 Two double-sprayed rows, 492 lbs.=: 83.6 bu. per acre. 

 One single-sprayed row, 182 lbs.= 61.9 bu. per acre. 

 Gain from spraying, 21.7 bu. per acre. 



Potatoes being worth 70 cts. per bushel at digging time the net 

 profit from spraying in this experiment was $8.79 per acre. 



