INSECTS AFFECTINf; PARK AND WOODLAND TREES 621 



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



]' o n t a n i a d e s m o d i o i d e s, p. 638 

 Fleshy, reddish galls in jiarallel rows on either side of the inidrib 



P o n t a n i a h y a 1 i n a, ]). 638 

 A eonelike deformity on tlie tips of willow siioots 



Willow cone gall, Rhabdophaga strobiloides, p. 639 

 Affecting noitch-hazel 

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



Witch-hazel cone gall, H o r m a p h i s h a m a m e 1 i d i s, \). 639 

 ^[any spined, green or reddisii bud galls 



Spiny witch-hazel gall, H a m a m e 1 i s t e s s ]> i n o s u s, p. 643 

 Affecting birch 

 Deformed catkins with enlarged, globular seeds 



Birch seed gall midge, O 1 i g o t r o j) h u s b e t u 1 a e, 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 hackberrv 

 Broadly rounded elevations on the under surface of the leaf 



Hackberry nipple gall, P a c h y p s y 1 1 a c e 1 1 i d i s - m a m \\\ a, 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 r o s a e, 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 bicolor, p. 647 



Smooth rounded galls on twigs Globular rose gall, Rhodites globulus, p. 647 



Elongated, hard, woody galls on twigs 



Long rose gall, Rhodites d i c h 1 o c e r u s, p. 648 

 An oblong or rounded gall on wild rose twigs 



Knotty rose gall, Rhodites v e r n a, p. 648 

 Affecting evergreens 

 Stunted pitch pine needles with basal enlargement 



Pine needle gall fly, C e c i d o m y i a p i n i-r i g i d a e, p. 423 

 Balsam needles with basal enlargement 



Balsam gall midge, C e c i d o m y i a b a 1 s a m i c o 1 a, p. 685 



