THE CONTROL OF INJURIOUS INSECTS 



379 



4. Hand-cart sprayer, a small barrel mounted on a hand cart and 

 operated by .a liand-pump. Useful in gardens. 



5. Barrel sprayer, with force pump operated by hand. Useful in 

 small orchards and gardens. 



6. Tank sprayer, with pressure pump operated either by hand, com- 

 pressed air, traction gearing, gasoline motor, or liquid carbon dioxide. 



FxG. 247. — An up-to-date spraying outfit in an apple orchard, using the "spra-gun." 

 {Courtesy of the Friend Manufacturing Co.) 



In orchard spraying every outfit should be provided with a spray-tower 

 so that the tips of the branches may be treated properly (Figs. 247 and 

 248). 



Other accessories are strong hose, able to withstand a pressure of 

 about 300 lbs. per square inch, half-inch hose being commonly used; 

 .and extension rods with drip guards and cut-offs. 



