14 CONNECTICUT EXPERIMENT STATION BULLETIN I55. 



(2) Spray the leaves with poison as soon as they have 

 opened, if their shot-hole appearance shows that the beetles are 

 there in abundance, and the under sides of the leaves should be 

 coated about June ist to destroy the larvae or grubs. 



(3) When, later in the season, the yellow pupae appear on 

 the trunks of trees and the ground beneath, kill them with a 

 spray of kerosene emulsion or by sweeping them up and burn- 

 ing or soaking with kerosene. 



The first and third measures should be taken by each house- 

 holder, church or social organization, at individual expense. 

 The spraying, which is difficult and expensive if the trees are 

 large, can only be done by concerted action of the town or 

 borough authorities. For extensive spraying work power 

 sprayers are desirable, but small elms or a few large trees can 

 be treated successfully by means of a hand pump of barrel size. 

 The "Niagara gas sprayer" in operation is shown in Fig. 6. 



