Mediterranean oak borer, Esposti heritage oak, and fire blight
Summary
A large oak at Town Hall came down due to the beetle, and other trees in the grove are being watched closely. Michael Hall Park is hosting a scientific treatment pilot with 15-20 product companies, and an expert update is planned for a future meeting.
At a glance
- Total mentions
- 4
- Last 30 days
- 1
Discussed at 2 meetings in the last 60 days; most recently Nov 4, 2026.
Impact analysis
Treatment and removal of mature oaks is costly for the town and expensive for homeowners, with no financial assistance program available for private tree removal.
Anyone who values Windsor's oak groves and shaded parks.
Oaks already infested may be lost; untreated nearby trees remain at risk.
Mentions & discussions (4)
Town Council Meeting - Nov 4, 2026
Windsor has injected 545 trees against the oak-killing beetle, hosted a no-cost treatment trial at Michael Hall Park, and lost about 17 trees. The 350-400-year-old Esposti Park heritage oak is naturally declining, and fire blight is hitting ornamental pears around the town green.
Town Council Meeting - Sep 16, 2026
Windsor lost about 109 acres of urban canopy between 2018 and 2022, running against its climate goals. Conflicts between homeowner sidewalk liability and tree preservation rules push people to cut trees down; the council wants solutions, from tree giveaways to an urban forestry plan.
Parks and Recreation Commission - Sep 9, 2026
An invasive beetle is killing valley and blue oaks in Windsor, which became Sonoma County's response epicenter. The town hosted the first treatment trial of its kind and has injected over 500 trees, but there is no proven cure yet.
Parks and Recreation Commission - Aug 12, 2026
A large oak at Town Hall came down due to the beetle, and other trees in the grove are being watched closely. Michael Hall Park is hosting a scientific treatment pilot with 15-20 product companies, and an expert update is planned for a future meeting.
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