LIST OF TREES WITH INJURIOUS INSECTS. 



395 



Name of tree or 

 shrub affected. 



Oak 



Name of insect. 



Spathegaster haccamm . 



iVeuroterus ficmipenms . 



Spathegaster tricolor 

 Neuroteras l(vviusculus . 



Spathegaster alhipes 

 Ne2(rote7-ns numismatis . 



Spathegaster aprilinus 

 Aphilothrix radicis 



1 1 corticis 



'< glohuli 



Andricus inflator . 



Nature of injuries. 



Produces "currant galls" 

 on flower.s or leaves. 

 Galls globular, soft, 

 and succulent. 



Produces galls on under 

 side of leaf. Centre of 

 gall concave, edges con- 

 spicuously turned up. 



Produces galls on under 

 side of leaf ; in clusters, 

 and hairy. 



Produces galls on under 

 side of leaf. Galls are 

 nearly smooth, white 

 or yellowish, the outer 

 edge turned up. 



Produces spindle-shaped, 

 smooth galls, causing 

 fairly deep indenta- 

 tions of leaf. 



Produces "button galls" 

 on under side of leaf. 

 Galls are depressed in 

 centre, surface covered 

 like silk velvet. 



Produces small, spotted, 

 pellet-like gall on mid- 

 rib of leaf. 



Produces " thin " galls, pre- 

 senting the appearance 

 of an undeveloped bud. 



Produces large many- 

 chambered galls at 

 base of trunk near 

 surface of roots. 



Produces galls in young 

 bark around a pruned 

 branch. 



Produces globular green 

 galls, projecting from 

 bud scales. 



Produces galls in inflated 

 portion of the terminal 

 twig. 



Produces galls on leaf, 

 causing an irregu- 

 lar globular swelling. 

 These galls have al- 

 ways an inner gall. 



