INSECT ATTACKS AND REMEDIES 121 



two operations " were completely successful, 

 and the wounds in the stems healed with re- 

 markable rapidity." On examining some of 

 these trees during the past season, it was 

 evident that Marnock's treatment had been 

 so far successful, though removing the grub 

 was evidently more efficacious than filling the 

 holes with the mixture he recommended. 



Though named tzsculi, the wood leopard 

 moth is not more partial to the horse-chestnut 

 than to other trees, being found commonly on 

 the elm, oak, and Spanish chestnut. Where a 

 branch of the horse-chestnut has been removed 

 by pruning, the wound is sometimes tunnelled 

 by the larvae of the wood leopard moth. 



The elm tree destroyer (Scolytus destructor] 

 is usually abundant in most parts of the country, 

 and is quite a pest to London trees. The 

 beetle is one-fifth of an inch long, stout and 

 cylindrical, and usually confines its attacks to 

 the elm. In June it bores into the inner bark, 

 forming galleries along which the eggs are 

 deposited. Trees infested by this beetle have 

 an appearance as if the bark had been riddled 

 with shot. Fortunately, unhealthy trees are 



