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.

Ailanthus moth

ailanthus webworm moth

ailanthus webworm moth