Plants as Affected by Animal Parasites. 173 



soldered to the wall as shown. "When it is desired to 

 spread the powder more, the disc B is used. 



For taller plants, a powder bellows is desirable. 



Liquids are best distributed with a force pump, fit- 

 ted with a hose of a length suitable to the height of the 

 tree or plant, and with an atomizing nozzle, or a hand 

 atomizer or knapsack pump (Figs. 69, 70, 71). In or- 



FlG. 71. Power sprayer foi 

 commercial orclnard. Cushman 

 Mfg. Co., St, Joseph, Mo. 



chard spraying larger pumps are desirable. In the home 

 or small commercial orchard hand pumps may be used. 

 There are two general types now on the market: one in 

 which the handle works vertically and in the other, hori- 

 zontally. The latter is more expensive but is adapted to 

 larger orchards and easier of operation. For large com- 

 mercial orchards power pumps, usually operated by gaso- 

 line, are most economical. If good work is to be done 

 in spraying large trees a rod to elevate the nozzle into 

 the top of the trees is necessary. These rods, known 



