130 



POPULAR FRUIT GROWING. 



Another type of spraying outfit is what is known as the 

 'gas sprayer." The spray mixture is run into a tight steel tank 



Fig. 61. — Forms of Vermorel Spray nozzles in common use. a. — Ver- 

 morel nozzle with an opening. c. — Vermorel nozzle with four 

 openings, b. — The top and base of extension rod, showing a 

 cap to keep the spray liquid off tlie hand. 



of 50 to 250 gallons capacity. A carbon dioxide gas tank is 

 connected with this and the gas released from it, according to 

 the pressure desired, into the spray tank. This method has 

 the advantage of being the most simple arrangement possible. 

 It is, however, expensive, since the gas tanks must be sent back 

 to headquarters to be refilled, involving considerable cost in 

 freight in distant locations, as well as the cost of refilling. In- 

 jury has frequently resulted to trees sprayed with this type of 

 sprayer, presumably because the carbon dioxide gas united with 

 the "lime" in the Bordeaux mixture, leaving free copper sul- 

 fate which burned the foliage. 



