EXPERIMENT STATION REPORT. 



^63 



found tliis absolutely effective. In the spraying- we used arsenate 

 of lead alniost exclusively. In the first part of the season used 

 the Bordeaux mixture with the arsenate of lead, using about ten 

 pounds of the latter and eight pounds of the Vv 

 fornifH- in paste fonn, with lime, to one hun- 

 dred gallons. There seemed to be a ten- 

 dencY for one mixture to neutralize the other 

 — at l(>ast in color — so that we could not see 

 the mixture on the leaves. 



The tussock moths were more numerous 

 than usual, but our spraying operations have 

 been in proportion to their increase, and the 

 campaign showed that their rise and fall were 

 absolutely in our control. This confidence is 

 emphasized by the additional ability to fight 

 them in the egg and pupa stage. 



On the whole, the spraying operations were 

 satisfactory in connection with the tussock 

 moth caterpillar and not satisfactory in 

 spraying for the elmdeaf beetle. This may 

 be because the elm beetles were more noticeable on the younger 

 trees and the leaves were more tender. 



It may be well to say in this comiection that in purchasing in- 

 secticides for the use of the commission, the desire to give local 

 competitors an opportunity to supply part of the outfit resulted in 

 obtaining a lot of imjierfectly-prepared material with a large pea*- 

 centage of free arsenic. It is not likely that this mistake will be 

 repeated. That the elm beetle is not in itself so diflicult to keep in 

 check is proved by our experience at New Brunswick, where it was 

 much more plentiful than in Newark, and a record of this experi- 

 ence finds a fitting phice here. 



Caterpillar of Tussock 

 Moth. After Riley. 



