Trunks with beetles must go—left on site, they hatch and attack nearby trees. Spraying doesn't guarantee kill.
Shredded limbs/chips are safe. Beetles prefer trunks, not limbs. Chippers destroy any in bark.
Use the mulch. Remove the trunks.
Pine Needle Mulch: Benefits, Terpene Concerns, and Safe Use
Tiny Brown Beetles in Home: Stored Product Pests, Not Woodworm
Longhorn Beetle ID: Cerambycidae Larvae Are Wood Borers
Pine Sawyer Beetle Indoors: Firewood Hitchhiker
Pine Sawyer Beetles Indoors: Firewood Source
Southern Pine Sawyer Beetle: Harmless House Visitor
Creating a Pine Needle Mulch Layer for Future Pine Plantings
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