140 Report of the Botanist of the 



The total expense of spraying ten acres five times was $40.07 the 

 items being as follows : 



345 lbs. copper sulphate, at 6c $20 70 



5 bu. lime, at 35c i 75 



10 lbs. white arsenic, at sHc .... 55 



305^ hours labor for man, at i7,'-<iC 5 33 



25 hours labor for man, at 15c 3 75 



281/2 hours labor for team, at I7>^c 4 99 



Wear on sprayer 3 00 



Total $40 07 



The cost of spraying per acre for each application was 80 cents. 



The increase in yield due to spraying was 62^/2 bushels per acre 

 or 625 bushels on ten acres. At the time the potatoes were dug they 

 could have been sold in Phelps at 50 cents per bushel. That is to 

 say, the 625 bushels were worth $312.50. Deducting from this sum 

 the expense of spraying. $40.07, there is left $272.43, which is the 

 net profit on ten acres. This is at the rate of $27.24 per acre. 



SALISBURY experiment NO. 2. 



This experiment, also, was conducted by J. V. Salisbury & Sons, 

 Phelps, N. Y. Fourteen acres of potatoes on sandy soil were sprayed 

 five times with the same outfit and in practically the same way^^ as 

 in the preceding experiment. Seven rows 800 feet long were left 

 unsprayed. 



The dates^^ of spraying were as follows : July 23, August 5, 18, 

 September 2 and 8. Poison was used only in the first spraying. The 



'"The only differences worth noting are the following: The work was all 

 done by one man. The water used for making the bordeaux was taken from 

 a spring at one side of the field. Sufficient of the arsenite-of-lime paste 

 (see footnote, page 136) to contain about three-fourths pound of white arsenic 

 was used with 50 gallons of bordeaux. 



13 The dates given are those on which bordeaux was applied to the rows 

 next the unsprayed rows. The spraying of the wliole field was not always 

 completed on these dates. 



