37 



Next to this was a spray of kerosene emulsion containing 7J/2 

 per cent, of kerosene, which, properly applied, killed practically all the 

 beetles — as many in one instance as 9000 to the tree. 



Burning in hibernation by a powerful kerosene blow-torch, of a 

 kind used to melt asphalt in paving streets, was effective and useful 

 when an orchard had been so cultivated as to concentrate the beetle? 

 under the trees, provided that the cover was of a kind to be burned 

 completely at a reasonable expense for kerosene and labor. 



None of the various other means and methods with which experi- 

 ments were made, were sufficiently useful or promising to justify their 

 recommendation. 



