Los Angeles is bustling with brightly colored figeater beetles, scientifically known as Cotinis mutabilis. These beetles, which are approximately an inch in length, are often noticed due to their distinctive metallic-green color and unpredictable flights. Unlike typical insects, these beetles have a penchant for colliding with bystanders. Megan Barkdull from the Natural History Museum of Los Angeles County explains that their substantial size and relatively small wings make controlled flight challenging.
A misconception persists that these beetles are blind. However, Barkdull clarifies that their vision functions well. According to data from the citizen science app, iNaturalist, their population peaks in Los Angeles around August, with sightings beginning in June and declining through fall.
Figeater beetles belong to the scarab family and favor soft-skinned fruits like figs and grapes. Over the years, they have expanded their territory. Initially observed in Utah in 2009, these beetles reached Colorado by 2012. They are native to Southern California, where their numbers have likely grown.
Several human factors contribute to their proliferation. Compost piles offer a feeding ground for their larvae. Irrigated lawns and gardens create a moist environment conducive to their survival. Additionally, fruit trees provide them with nourishment. Climate change is also making more areas suitable for their habitation.
Though they feast on fruits, figeater beetles are not considered pests. Karey Windbiel-Rojas from the University of California’s pest management program notes their role in breaking down decaying matter, especially as their larvae consume organic material in compost.
People often confuse them with Japanese beetles, a significant pest that damages crops and ornamental plants. However, the presence of Japanese beetles in California is limited, and efforts are made to eradicate them when found.
If you encounter a figeater beetle indoors, Windbiel-Rojas advises gently returning it outside, avoiding pesticides. She recounts handling one that flew into her hair at UC Irvine. Despite initial alarm, onlookers learned the beetle posed no threat, earning Windbiel-Rojas an ovation for her calm handling of the situation.