SPRAYING FOR CITRUS INSECTS AND MITES IN FLORIDA. 



9 



in groves where palmetto and other trees have not been removed, 

 and in groves so thickly planted that it is difficult to use a power 

 sprayer. A barrel pump can be used also for making emulsions 

 and for whitewashing. 



For extensive operations, however, experience indicates that either 

 a large lever pump or a gasoline power outfit should be used. 



Lever pump. The 

 large double-acting 

 hand pump (fig. 11) 

 can be used for 

 spraying even the 

 largest trees and 

 may be recommended 

 for groves as large 

 as 10 acres. This 

 type of pump, like 

 the barrel pump, 

 seldom needs repairs 

 and will supply two 

 nozzles very satisfac- 

 torily. These pumps 

 can be purchased in 

 connection with a 

 tank or separately. 

 If purchased sepa- 

 rately, a barrel is 

 used to hold the 

 spray material. The 

 chief difficulty with 

 both the barrel pump 

 and the lever pump 

 is the fact that it 

 costs at least the 

 wages of one man 

 to furnish t h e 

 power. This usually 

 amounts to about 6 

 to 10 times as much 

 as the cost for gasoline to run a power outfit. Another disadvantage 

 in using any type of hand-power pump is the irregularity of th? 

 pressure and the lack of stimulus to the men that is furnished by a 

 power-driven machine. 



Gasoline power outfit. For any extended work in spraying a power 

 outfit (figs. 12. 13) should be used. Owing to the nature of the soil 

 in Florida, spraying machines should be made as light in weight as 

 possible. It is verv doubtful if anv machine is practical under the 



FIG. 8. The brown fungus attacking the citrus white P.y. 

 The mycelium of the fungus has been turned back from 

 the lower left portion of the leaf. (Morrill and Back.) 



