Bagworm The bagworm is easily recognized by the brown 'bag-like' sack that it creates. Boxelder Bug While not known to cause significant damage, Boxelder Bugs can be quite a nuisance. Bronze Birch Borer This beetle affects non-native white-barked birch. It is a close relative of the emerald ash borer. Elm Leaf Beetle The elm leaf beetle is similar to Japanese Beetle, as they both leave an unattractive lace-leaf pattern to devoured leaves. Emerald Ash Borer The Emerald Ash Borer is an invasive species that is killing ash trees across North America. Japanese Beetle Japanese Beetles eat the leaf material between the veins, leaving a skeletonized look. Pine Wilt Nematode Pine Wilt Nematode is a species of roundworm that kills infested trees by stopping the movement of water within the timber. Scale: Armored The first of two types, armored (or hard-shell) scale are small insects that have a protective shell. Scale: Soft-Shell The second of two types, soft-shell scale are small insects that have no shell but instead a waxy coating. Spider Mites Spider Mites are very small and feed on the leaves of many different species of plants. Zimmerman Pine Moth Zimmerman Pine Moth is an extremely damaging pest to evergreens.