INSECT ATTACKS AND REMEDIES 127 



Collecting and destroying the larvae is 

 recommended. 



Coniferous trees suffer greatly from the 

 attacks of insects, and in several cases whole 

 plantations of the Scotch pine and larch have 

 required to be felled owing to the depredations 

 of the pine beetle and other woodland pests. 



The Larch Sawjiy (Nematus Erichsonii). Of 

 late years, in northern England especially, 

 larch plantations have suffered considerably 

 from the ravages of this insect. The larvae, 

 which are about three-quarters of an inch long, 

 with twenty feet, resemble those of the pine 

 sawfly and gooseberry caterpillar, and feed on 

 the leaves of the larch. An attacked tree can 

 readily be detected by its partially leafless 

 condition. It would be well, so as to keep 

 this recent importation in check, that a sharp 

 outlook should be kept on young larch planta- 

 tions during July and August. 



The pine beetle (Hylesinus (Hylurgus) 

 piniperda) is a dread enemy to not a few species 

 of Pinus, but particularly to P. sy/vestrts, 

 P. /anew, P. austriaca, and P. strobus. The 

 injury done by this beetle consists in its de- 



