Maple Borers: Low Spread Risk, Monitor and Protect

A maple died from borers. You worry about spread to neighborhood maples.

Spread Risk Is Low

• Borers (likely flatheaded or roundheaded) attack stressed or wounded trees.
• Healthy maples with intact bark are rarely infested.
• Adult beetles fly, but need suitable hosts (weak trees).

Protect Nearby Maples

1. Monitor: Look for boring dust (frass), single holes, wet bark, canopy thinning.
2. Prevent stress: Water during drought, mulch, avoid trunk damage (mowers), fertilize if needed.
3. Preventive treatment (optional): Soil-applied imidacloprid (Bayer Advanced) on high-value trees in spring.
4. Trunk spray (permethrin/Onyx) if early signs appear.

When to Call a Forester

Contact your state forestry agency for a free/low-cost inspection by a service forester—they know local pest pressures.

Bottom Line

Borers don’t swarm healthy trees. Keep maples vigorous; treat only if signs appear. A forester can confirm local risk.