I'. \. TllKoKAM) 



•2:j 



There is uo doubt it is iiitiuenccd very largely by the weather. Its 

 destructive nature under certain weather conditions can be understood 

 by the notes given here and the photos showing the damage, and it may 

 here be pointed out that both in the 184G and 1913 attacks, that the 

 previous winters were noted for their mildness and dampness. No 

 doubt these conditions place the Piceas in an unhealthy condition, 

 and that in consequence the effect of these sucking insects becomes 

 much more marked and at the same time the mild weather enables 

 the aphis to flourish right through the cold months. 



Description of the Insect. 



Apterous viviparous female. 



Green, oval, convex, with a darker line on each side of the body. 



B C 



Ficc. 1. 

 Aphif ahietina Walker. A Alate female B and C Apterous viviparous females. 



