15 



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 larvae 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 experim,ents were continued through two seasons, beginning 

 in the spring of 1896. Through the kindness of Mr. Joseph 

 Kennedy, of I^iverpool, 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 i lb. to 150 

 gals, of lime water and the arsenate of lead, i lb. to 45 gallons. 

 For the first spraying on two of the plats, 2 qts. of glucose was 

 added to each 45 gals, of the mixtures and for the second spray- 

 ing the same amount of thin glue. 



The treatment which each plat received the first year is shown 

 in the following diagram : 



Diagram op Plats in 1896. 



