Pest & Disease Treatment in the West Metro Area
Protect Your Trees from Insects and Disease Year-Round
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Trusted by homeowners
across the twin cities
OUR STORY
Protect Your Trees from Insects and Disease Year-Round
The biggest threats to your trees often go unnoticed until the damage is done. Japanese beetles emerge without warning, oak wilt spreads through fresh wounds in summer, and emerald ash borer can kill an ash tree within just a few years. By the time you notice symptoms, these problems have often been developing for months, making treatment more difficult and expensive. That's why prevention is everything.
Ostvig Tree Care monitors your trees through every season, identifying problems early when treatment is most effective. With four generations of experience and seven ISA Certified Arborists on staff, we know which pests and diseases threaten Twin Cities trees and when to stop them before they spread. We don't wait for visible damage. We stay ahead of it with proactive pest and disease treatment built into our PHC programs.
Warning Signs Your Trees Need Pest and Disease Treatment
Not every tree problem starts with dramatic symptoms. Learning to recognize the early warning signs can help you address issues before they spread and require more extensive treatment.
Common signs that your trees may need professional treatment include:
Premature leaf drop, yellowing, or discoloration in mid-summer
Holes, tunnels, or oozing sap in the bark or trunk
Visible insects on leaves, branches, or the ground below
Yellowing, browning, or abnormal needle drop on evergreens
Leaf spots, powdery coating, wilting branches, or unusual growth patterns
Weakened or dead branches, overall decline in vigor, or sparse canopy
If you've noticed any of these signs on your oaks, maples, ash trees, spruce, or arborvitae, a professional tree health assessment is your next step. If you don't see obvious damage but own mature ash or oak trees in the Twin Cities, we recommend a preventive assessment anyway, since emerald ash borer and oak wilt can spread silently for months before symptoms appear.
How We Stay Ahead of Minnesota Pests and Diseases
Ostvig offers multiple treatment methods, each suited to different pests, diseases, and tree conditions. Your arborist will recommend the most effective approach for your situation.
Spray Applications
Applied to foliage and branches, spray treatments target insects and diseases that feed on or infect leaves and twigs. Timing is critical, so we apply treatments when each pest is most active or when disease pressure peaks.
Trunk Injections
For invasive insects, like emerald ash borer, trunk injections deliver treatment directly into the tree's vascular system, offering highly effective protection. Only Certified Arborists, like Ostvig, can perform this work.
Soil Injections
Soil-applied treatments work through the root system to protect against certain insects and diseases. This method is effective for pests that target new growth or diseases that affect trees systemically.
Bark Drench and Drenching
These targeted applications treat specific areas of the tree or root collar, protecting against pests and diseases that enter through the bark or root zone.
Stop Pests Before They Harm Your Trees
Professional treatment starts with a thorough assessment. Our arborists will identify what your trees are facing and create a treatment plan built around your property and your goals.
How Ostvig Protects Your Trees Year-Round
We follow a seasonal approach based on Minnesota pest and disease cycles, not a one-size-fits-all schedule. This means we treat when it matters most.
Assessment & Diagnosis
Your arborist evaluates your trees, identifies any active threats, and reviews your property's history and vulnerability. We then build a seasonal treatment plan specific to your trees and the threats they face.
Seasonal Treatment Schedule
Treatment timing is just as important as the treatment itself. We schedule applications around the life cycles of common Twin Cities pests and diseases to provide protection when it's most effective.
Ongoing Communication
Throughout the year, we explain what we're seeing in your trees, why we're recommending specific treatments, and what to expect next. If conditions change or new issues emerge, we adjust your plan accordingly.
Long-Term Care & Monitoring
Pest and disease management is ongoing, not one-and-done. Many homeowners enroll in our annual PHC program, which bundles pest and disease treatment with monitoring, fertilization, and other services into one comprehensive plan.
Why Choose Ostvig for Pest and Disease Treatment
Treating tree pests and diseases takes more than the right products. It takes experienced professionals who can accurately diagnose the problem, recommend the right solution, and help prevent future issues from developing.
Four Generations of Tree Knowledge
Ostvig has been protecting Twin Cities trees since 1933. We've seen every major pest outbreak and disease cycle Minnesota throws at us. That experience means we recognize threats early and know exactly how to stop them.
Certified Arborists Who Diagnose, Not Just Treat
We have seven ISA Certified Arborists on staff, plus CTSP credentials and TCIA Accreditation. This depth of expertise means every treatment decision is backed by professional diagnosis, not guesswork. Your trees get expert care from people who've earned their credentials and stay current on regional pest threats.
Personalized PHC Programs
Every property has different trees, growing conditions, and pest pressures. We build your Plant Health Care program around what your landscape actually needs, adjusting recommendations as your trees mature and conditions change.
Recommendations You Can Trust
If your tree doesn't need treatment, we'll tell you. Our recommendations are based on what's best for your trees and shrubs, so you can feel confident you're investing in care that makes a difference.
One Reliable Partner for Every Tree
Whether you need pest management, disease treatment, pruning, or emergency care, Ostvig has the expertise to care for every aspect of your trees' health. Because all of your tree care is managed by one trusted team, recommendations stay consistent, and every service works together to protect your landscape.
Serving the Twin Cities West Metro & Lake Minnetonka
Ostvig Tree Care provides pest and disease treatment throughout the Twin Cities West Metro, with deep expertise in the Lake Minnetonka corridor where mature, high-value trees are the norm.
If you're unsure whether we service your area, reach out. We may still be able to help.
Expert Guides for Twin Cities Tree Health
Pest and disease treatment is just one part of keeping your trees healthy. Our blog offers in-depth articles on Minnesota pests, seasonal tree care, and expert advice from our arborists.
Jim Ostvig | August 14, 2026 | Tree Care Tips
Plant Health Care Programs: What’s Included & Why You Should Enroll
Plant health care keeps trees healthy for years. Discover what’s included in a PHC program, why they save money compared to removal, and how to get started.
Jim Ostvig | August 14, 2026 | Tree Care Tips
Best Time to Prune Trees in Minnesota (And When to Avoid)
Discover the best seasons for tree pruning in Minnesota. Learn why winter is best for most trees, plus species-specific exceptions and disease risks to avoid.
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.
Frequently Asked Questions About Tree Pests & Diseases
What Our Customers Say
Aaron O'Reilly — Google
Matt Van Beusekom — Google
Dina Brenny — Google
Stay Ahead of Pests with Ostvig’s Plant Health Care Program
Pest and disease management works best as prevention, not reaction. Let our arborists assess your trees and create a treatment plan designed for your property's unique needs.
