INSECTS AFFECTING PARK AND WOODLAND TREES 619 



Small globular galls on scrub and post oak 



Oak leaf bullet gall, Dryophanta polita, p. 626 

 Irregular, reddish or grjsenish galls in clusters on leaves and stems of white and scrub 



oaks Oak fig gall, B i o r h i z a f o r t i c o r n i s, p. 626 



Somewhat rounded, hard, woody, red, reticulate galls 



Warty oak leaf gall, C e c i d o m y i a p i 1 u 1 a e, p. 627 

 Rounded, oblong or oval galls with numerous long spines 



Oak hedgehog gall, A c r a s p i s e r i n a c e i, p. 627 

 A globular, spiny gall on dwarf chestnut oak 



Spiny oak gall, C y n i p s p r i a o i d e s, p. 627 

 Clusters of seedlike bodies on red oak. . . . Oak leaf seed gall, C y n i p s d e c i d u a, p. 627 

 Small, brown, buttonlike galls . . Oak button gall, Neuroterus u m b i 1 i c a t u s, p. 627 

 Marginal fold at base of leaf serration 



Marginal fold gall, Cecidomyia erubescens, p. 627 



Ga/Is on catkins or fruit 



Shotlike, white catkin gall Oak flower gall, A n d r i c u s p u 1 c h r a , p. 627 



A globular gall growing from the side of acorn cups 



Oak plum gall, Amphibolips prunus, p, 628 



Affecting hickory 



Galls on twigs 



Green or black irregular galls on leaf stem or twigs 



Hickory gall aphid, Phylloxera caryaecaulis, p. 33 r 



Galls on leaves 



Smooth, green, onion-shaped galls with pointed tip 



Hickory seed gall, Cecidomyia c a r y a e c o 1 a, p. 628 



D i p 1 o s i s c a r y a e, p. 628 



Subglobular, pubescent, onion-shaped gall 



Hickory onion gall, Cecidomyia h o 1 o t r i c h a, p. 628 



Rounded, brownish, downy gall 



Hickory peach gall, Cecidomyia persicoides, p. 628 

 Narrow, cylindric, tubelike galls . . Hickory tube gall, Cecidomyia t u b i c o 1 a, p. 628 

 Flattened, circular, yellow or whitish galls 



Hickory button gall, Phylloxera foveola, p. 629 

 Affecting maple 

 Red, yellow-ringed galls in red maple leaves 



Ocellate maple leaf gall, Cecidomyia ocellaris, p. 629 

 Slender, fusiform galls on upper surface of sugar maple leaves 



¥ usiform maple gall, Eriophyes acericola, p. 630 



