INSECTS, DISEASES, AND SPRAYING 7I 
air sprayers, costing about $6, complete, 
will be very satisfactory. They have a sling 
and are carried under the arm. The capacity 
is about two gallons of liquid. The knap- 
sack sprayer, which is carried on the back as 
its name implies, is also quite a good one, 
but has not the high pressure of the former, 
For field work the size of sprayer would 
depend on the acreage planted, the kind of 
sprayer would depend on the man’s likes 
and dislikes and the amount of money he 
has to invest. For small fields where the 
grower is just starting in, and wishes to, or 
has to, practise economy, a barrel pump, 
mounted in a good oil barrel, with the 
necessary hose, nozzles, piping, etc., is a very 
practical outfit. 
A man with some mechanical ability can 
arrange with gas pipe a four-rowed sprayer, 
mounting the complete outfit on a two- 
wheeled rig, having the wheels so that they 
spread two rows of plants, the horse walking 
in the middle cultivated strip. With a good 
horse, one man can pump and drive. 
For larger fields some of the much adver- 
tised spray rigs with all their equipment are 
advisable. Some of these sprayers have 
