172 



PEACH LEAF CURLI ITS NATURE AND TREATMENT. 



For orchards of inediuiu to largo size it is better to obtain more 

 powerful pumps — those capable of throwing- four strong sprays. The 

 pimips shown in figs. 8, 9, and 10 are admirably suited for this class 

 of work. Pumps of the type shown in fig. 8 are used in the 1,600- 

 acre Rio Bonito orchard. In this orchard one man pumps for four 

 men spraying (Pis. XXVII and XXVIII). In many portions of 

 California the pneumatic pump, shown in fig. 10, is a favorite. It has 

 been used extensively in the spraying of orange groves where the 

 trees are large and where high pressure is necessary to throw the 

 spray to their tops. The pumps shown in figs. 8 and 9 have perpen- 



FiG. 7.— Spray pump for iise on barrel or tank. 



dicular levers, thus avoiding the bending or stooping motion of the 

 operator. The levers of each of the three stj^les shown are long, and 

 both the strength and capacity of the pump is sufficient. The style 

 of pimips, both for small and large orchards, to which attention is here 

 called, will be found figured and listed in catalogues usually to be 

 found in the hands of leading hardware dealers. 



Within the past few years leading orchardists and others have 

 tested, with varying success, the application of different motive 

 powers to the operation of spray pumps. Steam and gasoline engines 

 have received most attention for this purpose. Many of the power 



