334 Report oF THE ENTOMOLOGISTS OF THE 
Of the two classes of methods used in combating this insect, 
the latter has proven much more satisfactory; but unfortunately 
owing to the small size of the willows, the machines cannot be 
used to advantage early enough in the season to prevent serious 
injury by the beetles which first appear in the spring and also 
by the young larve as they are not as readily dislodged. 
In order to ascertain if possible whether the insect could be 
satisfactorily held in check by the application of an arsenical 
poison, thus providing a way to stop the injury to the willows 
early in the spring before the machines can be used to advantage, 
the following experiments were undertaken. 
? 
EXPERIMENTS. 
The experiments were continued through two seasons, beginning 
in the spring of 1896. ‘Through the kindness of Mr. Joseph 
Kennedy, of Liverpool, N. Y., a field of about an acre of willows 
on his farm was reserved for the experiments. Green arsenite 
and arsenate of lead were the poisons selected the first year as 
being most likely to prove satisfactory. 
The green arsenite was used at the strength of 1 pound to 150 
gallons of lime water and the arsenate of lead, 1 pound to 45 
gallons. For the first spraying on two of the plats, 2 quarts of 
glucose was added to each 45 gallons of the mixtures and for the 
second spraying the same amount of thin glue. 
The treatment which each plat received the first year is shown 
in the following diagram: 
DIAGRAM OF PLATS IN 1896. 
| 
| 


Dates of 
sprayings. Plat I 
June 5. | Green arsenite. | Green arsenite , Untreated. ; Arsenate of lead 
and glucose. and glucose. — 
Plat II. Plat III. Plat IV. 


19. | Green arsenite. | Green arsenite | Untreated. | Arsenate of lead 
and thin glue. and thin glue. 
SS A SEN 
