Q: This bug was on my storm door the other day. The pattern looked kind of like an elongated ladybug.
A: It’s an ailanthus webworm moth. The caterpillar feeds on the leaves of a “trash tree” named Tree-of-Heaven, Ailanthus altissima.
The moth is a pollinator and I see many of them on the flowers of my sedum plants each fall.
There is no need to control them.