distorted, twisted terminals are evidence of its attack. Eaton and 
Yuill (215) discussed its biology and control. The larvae of C. 
resinicola (O. 8S.) (fig. 166) are found in small patches of fluid 
resin exuding from wounds caused by their feeding in Virginia 
pine. C. reeksi Vockeroth larvae are found in similar situations in 
jack pine. C. cupressi (Schweinitz) feeds in the seeds and causes 
a leaf gall on bald cypress. 
Several other species of Cecidomyia also attack a variety of 
eastern trees. C. catalpae Comst. larvae feed on the young leaves 
and seed pods of Catalpa. Damaged leaves wilt and fall prema- 
turely, and the terminals of heavily infested trees may be dwarfed 
and stunted. C. poculum O. S. produces clusters of pale or red 
saucerlike galls that are attached by slender stalks to the under- 
surfaces of oak leaves. C. pellex O. S. produces reddish-brown bul- 
let galls on ash. C. ocellaris (O. S.) causes the yellow galls mar- 
gined with red that are often seen on the upper surface of red 
maple leaves. C. verrucicola O. S. produces wartlike galls on the 
leaves of basswood. C. foliora Rssl. and Hkr. produces marginal 
fold galls on the leaves of black, red, and pin oaks. Finally, C. 
cerasiserotinae O. S. produces bright red or yellow irregular bud 
or terminal galls on wild cherry. 
Oligotrophus papyrifera Gagné larvae feed in the buds of paper 
birch in the Lake States, causing the formation of galls (fig. 167). 
The galls are comprised of the basal portions or all of one or two 
F-501805 
FIGURE 166.—Resin masses | 
caused by feeding activity 
of larvae of Cecidomyia 
resinicola. 
