New Yorx AGricutruraL Expertment STatron. 335 
Experiments in 1896.— As shown in the table, the plats were 
sprayed but twice in 1896. Unfavorable weather prevented a 
third spraying until too late to be practicable and the machines for. 
catching the beetles were used twice, about seven days apart, after 
the last spraying. For these experiments a knapsack sprayer was 
used to apply the poison. When lime was ‘used, enough of the 
freshly-slaked lime was added to make the mixture avant y, milky 
in appearance. | 
Results in 1896.— It was difficult to obtain exact results in 
this case. Swarms of beetles came from other fields to the 
sprayed plats. Ihe general indications were that the plats 
sprayed with green arsenite mixed with lime water and glue and 
with arsenate of lead and glue were less injured after the second 
spraying than the other plats. About 80 per cent of the willows 
on these plats were uninjured by the beetles, while on Plat ITI, 
the check plat, at least 50 per cent were damaged. Glucose did 
not prove as successful in making the mixture adhere to the leaves 
as thin glue, but glue was found to be impractical for this purpose 
because of sticking in the pump and clogging the nozzle. 
Experiments in 1897.— The plan of the experimental field was 
changed for these experiments and a Peppler horse power sprayer 
used in place of a knapsack. As shown by the diagram the acre 
was divided into two equal plats and both plats sprayed on June 3.° 
The machine for catching the insects was not used on either plat. 
Plat II received but one application of the poison while Plat I 
was sprayed as shown in the following diagram. a 
The green arsenite was used at’ the strength of 1 pound’ to 100 
gallons of lime water. Whale oil soap, 1 pound to 20 gallons of 
the mixture, was added to make it spread upon the leaves. Whale 
oil soap also doubtless acts as a repellant to the insects and may 
be used much stronger. . | 
é The original plan was to leave Plat II unspré ed but through a misunder- 
standing it received one application of the poison. 
