77 



After heavy vain one often has to spray 

 again, as rain easily washes off lead arse- 

 nate, &c., but it also often does good as it 

 distributes the fluid to parts otherwise not 

 reached by the sprayer, and this is notice- 

 able in fungicides such as Bordeaux and 

 Burgundy mixtures. 



Spraying Machines. 

 General Precautions. — 1. A sieve should 

 be fitted on to the machine, through which 

 all washes should be strained to prevent 

 blocking of pvunp and nozzle, also the 

 suction hose should have a fine mesh sieve 

 fitted to doubly insure against any stop- 

 page. 



sary, especially where insoluble sub- 

 stances like lead arsenate and the copper 

 compounds in Bordeaux and Burgundy 

 mixtures, which easily sink in the fluid, 

 are being used. Without them one would 

 often be spraying only a dilute wash 

 after a few minutes' work. 

 3. Nozzles, which are one of the chief 

 factors to be taken into consideration, 

 will be dealt with later. 

 Different forms of spraying machines 

 ai-e used for different purposes and in vary- 

 ing circumstances. 



Power Sprayers.— They are now coming 

 into general use in England, being more 



A Tw9-hors« Motor Sprsyer. cJ American roilse; 200-g»Uoas capacity. 



2. Wash out after use before putting 

 away with water or soap and water, the 

 latter to be used after oil emulsions. This 

 cleansing applies to every class of machine, 

 otherwise corrosion soon sets in. 



The main points to be looked for in the 

 purchase of spraying machinery are : — 



1. An Efficient Pump, giving a good pres- 

 sure and fitted with brass ball valves 

 and an air chamber, so that continuous 

 pressure may be maintained. 



2. Agitators.— These should work with the 

 action of the pump, and are neces- 



efficient in pressure and do the work so 

 much quicker than hand-power machines, 

 and their use is meeting with great 

 appreciation. 



It is considered to be economical to use 

 motor spi'ay pump if there is more than 

 30 acres of fruit trees. Such machines are 

 largely used in large farms in our colonies, 

 driven by oil or gas engines. 



The spray fiuid is mixed in a central tank 

 and kept properly agitated; from this it 

 is pumped through main delivery pipes laid 

 permanent!}- or temporarily in the planta- 



