202 INSECTS AFFECTING THE ORANGE. 



Cost of kerosene wash. The following is the estimated cost for a standard wash 

 of whale-oil soap and kerosene emulsion containing 67 per cent, of oil, and diluted 1 

 to 9: 



Kerosene, 2 gallons, retail at 20 cents $0.40 



Soap, i pound, retail at 10 cents 5 



Water, 1 gallon 



Emulsion, 3 gallons 45 



At wholesale rates, 18 cents for kerosene and 8 cents for soap, three gallons of emul- 

 sion cost 40 cents = 13 cents per gallon. One gallon of emulsion = 10 gallons of 

 diluted wash ; cost, 15 cents. Cost of wash per gallon, 1^ cents. 



With the "Aquapult" pump and " Cyclone" nozzle, four gallons of wash is suffi- 

 cient for thirty nursery trees of one and two years from the bud. Cost per tree, two- 

 .tenth cent. 



Trees which have been transplanted and have made two years' average growth in 

 the grove (3 or 4 years from the bud) require about two-thirds of a gallon of wash. 

 Cost, I cent per tree. Bearing trees of full size will require from 5 to 10 gallons of 

 wash. Cost, 7 to 15 cents ; average about 10 cents per tree. 



TABLE 2. WHALE-OIL SOAP. 



In Table 2 are given the results of experiments with solutions of whale-oil soap 

 applied in fine spray to all parts of the trees by means of the aquapult pump. The 

 solutions were all applied hot, being either solid when cool or too thick for spraying 

 through the pump. 



