Spraying by Knapsack Pump. 



Years ago I once kept account of the 

 eost of spraying an acre of bush apple 

 trees 11 years old, planted 9ft. apart (too 

 close), using a Vermorel knapsack. It 

 took 107 gallons of water (43 knapsacks of 

 2J gallons) ; 10 ozs. of Paris green at 2s. 

 per lb., Is. 3d. ; 91bs. of copper sulphate 

 at 3fd. per lb., 3s.; 121bs. of lime at jd. 

 per lb., 3d.; labour (one man 2| days at 

 4d. per hour), 9s. ; cartage of water and 

 use of pump, water, say. Is. 6d. ; total 

 16s. ; 16s. divided by 494 trees equals 

 nearly |d. per tree. 



Since then the fashion of sprays has 

 changed to lead arsenate and lime sid- 

 phur at a higher cost. The present cost 

 would be three or four times as much- 

 say £3 per acre, or IJd. per tree. 



Four Oaks Knapsack Sprayer at work. 



