04 



I>.(". ExT()-M()L(ii;ic.\L SoriE'i" 



Although the work of this insect is ver.v niiirlied upou a limited number of trees 

 in Stanley Parle, the present theory is that at the moment it is important only as a 

 very effleieut secondary enemy to assist its more destructive ally, the gall-chermes. 

 To form an idea of its potentiality for destruction, however, one need only go and 

 visit the Beacon Hill Park at Victoria, where several large spruce have been seriousl.v 

 damaged by its ravages during the past two or three years. The work of the aphis 

 is ver.v characteristic, causing yellowing of the needles, which finally fall off. leaving 



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the jiresent .vear's crop in sole possession. Tliis species has been studied in England 

 by I'rofessor F. V. Theobald (Annals of Ai>plied Biology, -N'ol. I.. No. 1, 1!)14, May, 

 page 22). who found it destructive to various sjiecies of siiruce. In 1910 it was also 

 recorded by Professor II. P. Wilson from (.'orvaliis, dregon, who wrote in June, lOlii, 

 that this aphis had proved very destructive all down the coast of Washington and 

 Oregon. 



