The Carpenter Moth (Prionoxystus robiniae), the Leopard Moth, is a large, white moth densely spotted with dark blue-black spots and blotches. Its larvae spend two to three years boring through the heartwood of oaks, willows, and other hardwoods, creating large tunnels that weaken trees. It is attracted to lights and its large size and striking pattern make it memorable.
Best time to see a Carpenter Moth
The best time to see a Carpenter Moth is April–June, when about 67% of U.S. sightings happen, based on 8,012 research-grade iNaturalist observations.
Not certain it is a Carpenter Moth? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Carpenter Moth sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted a Carpenter Moth?
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