These beetles were feeding on chaste tree, so they're herbivores. But don't spray until you see significant damage—natural enemies may keep them in check.

Borers in Locust and Willow: Identification and Treatment
Frogs in the Bathroom: How They Enter and What to Do
Earthstar Mushrooms in the Lawn: Harmless Decomposers
Grub Control: Why Doing Nothing Is Often Best
Asian Ambrosia Beetle on Dogwood: Toothpick Frass Signals Death
Tiger Beetle Larvae: The "Snake" in Your Yard
Colorado Potato Beetle on Tomatoes: Identification and Control
Pine Beetle Pitch Tubes: Identify the Borer
Dobsonfly and Hellgrammite: Stream-Side Insects
Controlling Daisy Beetles on Coneflowers and Black-Eyed Susans
Powder Post Beetles in Furniture: Identification and Control
Safe Indoor Flea Control with a Toddler in the Home
Pine Beetles: Remove Infested Trunks, But Chips Are Safe for Mulch
After Pine Beetle Kill: Remove Tree Fast, Spray Neighbors, Don't Store Wood
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