LIST OF TREES WITH INJURIOUS INSECTS. 



413 



Name of tree or 

 shrub affected. 



Scots Pine 



Silver Fir 



Snowberry 

 Spindle-tree 



Spruce . 



Name of insect. 



Retinia turionana . 

 M buoliana . 



ii resinella . 

 Lachnus pint 



Chermes pini 

 Cryphcdus picece . 

 Sirex gigcts . 



Megastigmus strobilobius 



Dioryctria abietella 

 Chermes picece 



Chromatomyia obscurella 

 Aphis eaonymus . 



1 Ernobius mollis . 



Hylastes palliatus . 



Cryphcdus abietis . 



Nature of injuries. 



Larva lives in terminal 

 bud and arrests de- 

 velopment. 

 Larva lives in terminal 

 shoot, which generally 

 dies as the result of 

 the injury. 

 Larva makes a gall of 

 resin on side of young 

 shoot. 

 Black eggs may be found 

 in winter, and Aphides 

 in summer, amongst the 

 foliage. 

 Insects live within woolly 

 covering on shoots or 

 young stems. 

 Female beetle is said 

 to make burrows in 

 branches. 

 Larvaj bore into back- 

 going trees or recently 

 felled timber. 

 Larvaa feed on kernel of 



seeds. 

 Larva? feed on cones 

 Insects live within 

 woolly covering on 

 bark. 

 Produces winding mines 



on leaves. 

 Aphides often kill lead- 

 ing shoots and form a 

 rosette of leaves. 

 Larvae make burrows 

 under bark of dry 

 poles. 

 Female beetle and larva; 

 make irregular gal- 

 leries under bark. 

 Female bores under bark 

 generally at knots of 

 the branches, and 

 scoops out a sort 

 of recess from which 

 the larval galleries 

 radiate. 



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52 



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116 



1 Also under bark of larch paling. 



