10 feet long, having a brass tube passed through it to carry the
nozzle. The Vermorel nozzle is the best type to use. The cost of a
barrel outfit, including two lines of hose, nozzles and truck,
should be from $30 to $40. Power sprayers cost from $150 to $300 or
more.

Spraying material:
_Arsenate of lead_ should be used in the proportion Of 4 pounds of the
chemical to 50 gallons of water. A brand of arsenate of lead
containing at least 14 per cent of arsenic oxide with not more than
50 per cent of water should be insisted upon. This spray may be used
successfully against caterpillars and other leaf-eating insects in
the spring or summer.

_Whale-oil soap_ should be used at the rate of 1½ pounds of the soap
to 1 gallon of hot water, if applied to the tree in winter. As a
spray in summer, use 1 pound of the soap to 5 gallons of water. This
treatment is useful for most sucking insects.

_Lime-sulfur wash_ is an excellent material to use against sucking
insects, such as the San José scale and other armored scales. The
application of a lime-sulfur wash when put on during the dormant
season is not likely to harm a tree and has such an excellent
cleansing effect that the benefits to be derived in this direction
alone are often sufficient to meet the cost of the treatment.
Lime-sulfur wash consists of a mixture, boiled one hour, of 40
pounds of lime and 80 pounds of sulfur, in 50 gallons of water. It
may be had in prepared form and should then be used at the rate of 1
gallon to about 9 gallons of water in winter or early spring before
the buds open. At other times of the year and for the softer-bodied