10 FARMERS’ BULLETIN 101. 
The question as to the best spraying apparatus to be used is an im- 
portant, one, the prime object being to destroy the insect without 
injuring the plant; the second, to avoid useless waste of the poison. 
Hand pumps and sprayers are unsatisfactory. One of the best types 
of orchard sprayer is desirable. This usually consists of a tank of 
about 100 gallons capacity equipped with a pump driven by a gaso- 
line engine, mounted on a strong cart or wagon fitted with the 
2 proper length of hose 
and drawn by either one 
or two horses. Fre- 
quently one operator is 
enough, but two are bet- 
ter for most purposes, 
especially in the case of 
high trees. 
In regard to nozzles, 
the older types, such as 
Vermorel and Bor- 
Fig. 12.—Habrocytus thyridopterigis. Greatly enlarged. deaux, mav be used, but 
(From Howard.) ; 
the new solid spray or 
Worthley type (fig. 18) is preferable. In case tall shade trees in 
valuable parks or woodlands are to be treated—trees such as spruce, 
cypress, hemlock, and willow, as well as maples—high-power spray- 
ers are preferable. The type which has given the most satisfactory 
results in the gipsy-moth work can develop sufficient power to carry 
a stream which breaks into a fine mist in the air, and this is very 
satisfactory in rapid treatment. With such a sprayer it is not neces- 
sary to climb trees or 
to use small lines of 
hose or turrets. 
In the treatment of a 
great number of trees 
a greater strength, 
namely 2 or 3 pounds 
of arsenate of lead to Fic. 15.—Solid spray or Worthley type of nozzle, and cut-off. 
f (Original.) 
50 gallons of water or 
Bordeaux mixture, is desirable, as the bagworms do not feed in 
masses and the poison must be directed so as thoroughly to coat and 
remain on the foliage where it will be eaten with the leaves. The 
treatment should be thorough and the application made evenly in 
order to secure the best results. Recent inquiry has elicited the in- 
formation that arsenate of lead is being used with the highest power 
sprayers even at the rate of 10 pounds to 50 gallons of water, which 
