Skip to main content

I found this interesting orange and black insect on my Spanish needle wildflowers.  What is it? 

It is one of the Ermine moths called an Ailanthus Webworm Moth, Atteva aurea. Because the moth tucks its wings close around its body, most people mistake it for a long, thin beetle. The adult moth was most likely feeding on nectar from the wildflowers in your yard.

The Ailanthus Webworm moth is found all along the eastern part of the United States. The moth larvae live mostly in webbing in groups on a tree called the Tree of Heaven (Ailanthus altissima). The larvae weave webs while they feed on the leaves.

These larvae are not the cause of the familiar webs we see on our forest or pecan trees because those are the result of feeding by fall webworms or army worms. The Tree of Heaven is also known as stinking sumac, Chinese sumac, varnishtree and stinktree.

It does seem odd to think of anything called the Tree of Heaven also being called a stinking sumac. But it is called stinking sumac because if the leaves are crushed they leave a foul smell on the hands. Another interesting piece of trivia: “A Tree Grows in Brooklyn” used the Tree of Heaven as its main metaphor.