THE SAN JOSE SCALE AND ITS CONTROL. a 
likely to solidify on cooling when used at the strength just indicated, 
and are hence forced through the spray-nozzle with difficulty. For 
spraying trees in foliage the soap should be used at the rate of 1 pound 
to 3 or 4 gallons of water, or somewhat weaker. 
SPRAYING APPARATUS. 
For the successful application of sprays to trees and plants infested 
‘with the San Jose scale some form of spraying apparatus is necessary. 
For small plants, as low trees, ornamental hedges, etc., a bucket pump 
(fig. 14) or a knapsack pump (fig. 15) will be satisfactory. The 
barrel pump (fig. 16) will permit of more thorough work and will be 
suitable for orchards of some size. It may be placed in a wagon or 
cart or mounted on a sledge. For large commercial orchards the 
hand-power tank, or gasoline outfits, are, of course, employed. (See 
fig. 17.) It is quite practicable in case but a few trees in the yard 
are to be treated to apply the wash on the limbs and branches by 
means of a brush, or even with old cloths. Fish-oil soap is excellent 
in such cases. Severe pruning of the trees is usually desirable to 
simplify the work of treatment, and also to produce a new growth 
of noninfested wood. 
WASHINGTON : GOVERNMENT PRINTING OFFICE : 1915 
