New York Agricultural Experiment Station. 147 



At each passage six rows were sprayed, with one nozzle per row, 

 applying bordeaux mixture at the rate of about 22 gallons per acre. 

 In successive sprayings the rows were gone over in opposite direc- 

 tions and the nozzles adjusted so as to spray the plants from both 

 sides and on top. The bordeaux was of the i-to-83^ formula. In 

 the first four sprayings paris green was used with the bordeaux at 

 the rate of four pounds to 50 gallons ; but in only one of these spray- 

 ings, the second, was the entire 153^ acres gone over. On the un- 

 sprayed 23^ acres paris green was applied twice, July 8 and 13. 



The potatoes were of the variety Sir Walter Raleigh. Water for 

 making the bordeaux was obtained from a well 100 rods distant. 

 The cost per acre for each spraying was 39 cents. 



This experiment is of special interest because of the large number 

 of sprayings and because the area left unsprayed is unusually large, 

 25^ acres. It ought to satisfy those persons who hold that field 

 experiments should be made on acres instead of on plats. The ex- 

 periment was carried through entirely by Mr. Martin and the figures 

 are given solely on his authority, but the writers have every reason 

 to believe that the facts are correctly stated. 



Mr. Martin informs us that he has carried on similar experiments 

 for several years past, always with profitable results. 



the dodson experiment. 



This experiment was made by Dobson Bros., Charlotte, N. Y., 

 seven miles north of Rochester. The field contained five acres and 

 was planted with three varieties ; namely, Michigan Snowflake, Rural 

 New Yorl<er No. 2 and American Wonder. Two rows, 451 feet 

 long, of each variety were left unsprayed. 



The first spraying was made July 21 with bordeaux mixture (i-to- 

 II formula) and paris green (}4 pound to 45 gallons). As some 

 of the " bugs " were not killed, a second spraying with bordeaux 

 and paris green was made a few days later. This time, bordeaux of 

 the i-to-73/^ formula was used and paris green added at the rate of 

 one pound to 45 gallons. The " bugs " were then all killed and 



