Browse 1,949 trees with seed pods stock photos and images available, or start a new search to explore more stock photos and images. of 33 NEXT. May 08, 2015 · Expert Response. This is likely fall cankerworm ( Alsophila pometaria ). The larval stage of this native insect feeds on the leaves of hardwood trees, particularly oak, maple and ash. In 2014 and 2013 populations of fall cankerworm were high in many parts of Southern Maryland. In late April through May, the fall cankerworm can defoliate trees.