. Better fruit. Fruit-culture. Page 6 BETTER FRUIT August, 1921 pounds with two guns operating, provided the discs arc cut down fine enough. How- ever, in cutting down these openings the actual carrying properties of the spray is materially limited and as a result the tops of the trees suffer, especially so in sections inclined to be windy. Guns so equipped with fine discs are usually handling no more than 2Y2 gallons of spray per minute. This is an uneconomical unit, as the operator can use much more material satisfactorily and a spray of this nature is one with no "kick" behind it.
. Better fruit. Fruit-culture. Page 6 BETTER FRUIT August, 1921 pounds with two guns operating, provided the discs arc cut down fine enough. How- ever, in cutting down these openings the actual carrying properties of the spray is materially limited and as a result the tops of the trees suffer, especially so in sections inclined to be windy. Guns so equipped with fine discs are usually handling no more than 2Y2 gallons of spray per minute. This is an uneconomical unit, as the operator can use much more material satisfactorily and a spray of this nature is one with no "kick" behind it. If larger openings are used in the discs the spray from this small outfit becomes coarse and stream-like, due to lim- ited pump capacity, and where employed is usually associated with very poor success with insect and disease control. At no time should more than one gun be used on a of this type. JUST what the economical unit to employ in the case of the output from the spray gun has not yet been definitely estab- lished. These requirements would probably vary in trees of different sizes; it being possible to use more spray per minute per gun with economy on very large trees than could be done on small trees. The writer's observations indicate that about 5 gallons per minute per gun at 300 to 325 pounds pressure is a unit that can be used to great- est advantage. Some growers have been noted using more spray than this per minute, but usually their operations are accompanied with considerable waste of material; 5 gal- lons per minute properly applied keeps a man busy, especially so with trees of mod- erate size. Nevertheless, much ground is being covered and very good work is being done. As a general rule two guns to a machine are most often employed and are probably the most economical unit for the average orchardist to employ. In the case of very large trees the time will come in most or- chards when some spraying will have to be done from the top of the rig in order
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