INSECTS AFFECTING PARK AND WOODLAND TREES 62 1 



Smooth, fiattish, sessile, yellowish green galls on both sides of the leaf 



Pontania desmodioides, p. 638 

 Fleshy, reddish galls in^parallel rows on either side of the midrib 



Pontania h y a 1 i n a, p. 638 



A conelike deformity on the tips of willow shoots 



Willow cone gall, Rhabdophaga strobiloides, p. 639 

 Aff <:cti ng a 'itch - hazel 

 Conical, green or reddish galls on upper surface of the leaves 



Witch-hazel cone gall, Hormaph is hamamelidis, p. 639 

 Many spined, green or reddish bud galls 



Spiny witch-hazel gall, Hamamelistes spinosus, p. 643 

 Affecting birch 

 Deformed catkins with enlarged, globular seeds 



Birch seed gall midge, Oligotrophus betulae, p. 647 

 Affecting sumac 

 Pear-shaped, round or reddish galls on the leaves 



Sumac tomato gall, Pemphigus r h o i s, p. 647 

 Affecting hackberry 



Broadly rounded elevations on the under surface of the leaf * 

 Hackberry nipple gall, Pachypsylla celtidis-mamma, p. 647 



Affecting rose 



A large, smooth, reddish brown root gall . . Rose root gall, Rhodites radicu m, p. 647 

 Fibrous, mosslike masses on rose and blackberry bushes 



Rose bedegar, Rhodites rosae, p, 647 



Irregular, spheric, mealy galls Mealy rose gall, Rhodites i g n o t a, p. 647 



Round galls covered with prickly spines . . Spiny bullet gall, Rhodites b i c o 1 o r, p. 647 



Smooth, rounded galls on twigs Globular rose gall, Rhodites g 1 o b u 1 u s, p. 647 



Elongated, hard, woody galls on twigs 



Long rose gall, Rhodites dichlocerus, p. 648 

 An oblong or rounded gall on wild rose twigs 



Knotty rose gall, Rhodites verna, p. 648 

 Affecting evergreens 

 Stunted pitch pine needles with basal enlargement 



Pine needle gall fly, Cecidomyia pini-rigidae, p. 423 

 Balsam needles with basal enlargement 



Balsam gall midge, Cecidomyia balsamicola, p. 685 



