jau. IS. I9IS Agrilus Bilineatus 293 



hope that they will recover the next spring. These are the most danger- 

 ous trees, for, as has has been pointed out, the trees with sap are more 

 favorable to the insects than the dry ones in which the larvae are liable to 

 dry up or starve. 



The need of other methods, however, seemed imperative. During the 

 past season the trunks and large limbs of some trees were sprayed with 

 an iron- sulphate and lime-sulphur mixture, while others were sprayed 

 with a Bordeaux mixture. This was done as a preventive measure 

 during the egg-laying season and it seemed successful, as no beetles 

 were seen on the trees Nvhich had been sprayed, even though the trees 

 had been covered with beetles the day previous to this treatment. In 

 contrast to this beetles were seen in great numbers throughout the 

 season on the unsprayed trees near by. 



Other experiments which are under way can not be reported until at 

 least another season has passed, and greater opportunity has been offered 

 to try out proposed methods of prevention and control. 



