Tree Pests and Diseases

Learn to identify and treat common tree pests and diseases before they damage your Minnesota trees. From invasive insects to fungal infections, discover how to spot problems early and protect your landscape’s health.

Close-up of bark beetle on tree bark, a common tree pest.

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Jim Ostvig | August 14, 2026 | Tree Pests and Diseases

Oak Wilt Prevention: Minnesota’s Year-Round Seasonal Guide

Worried about oak wilt? Learn when it spreads, how to recognize symptoms, and the best times to prune, treat, and protect Lake Minnetonka oak trees.

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