Violet-Toothed Polypore Is Active Right Now — Here's What to Do This November

If you've noticed strange, shelf-like brackets appearing on the bark or base of your trees this fall, you may be looking at violet-toothed polypore (Trichaptum biforme) — a wood-decay fungus currently in peak activity across much of the eastern United States. November is a critical month for homeowners to take stock of what's happening on their property, and this fungus deserves your attention before winter sets in.

Check our seasonal forecast to see what other threats may be active on your property this month.

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Why November Matters for This Threat

Violet-toothed polypore follows a typical activity window that spans much of the growing season — generally February through June, and again from September through November. That means November sits squarely within this fungus's expected late-season peak, making right now one of the more important times to walk your property and assess your trees.

As deciduous trees drop their leaves, the trunk and scaffold branches become much easier to inspect. Fruiting bodies that were obscured by summer foliage may now be plainly visible. At the same time, the cool, moist conditions of late autumn can favor fungal activity on already-stressed or compromised wood. Don't let the end of the growing season lull you into a false sense of security — what you find now can shape how you manage your trees heading into next year.

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What to Look for Right Now

Violet-toothed polypore is a wood-decay fungus observed in natural settings, with research-grade observations documented through community science platforms like iNaturalist. When conducting your November inspection, look for:

• Shelf-like or bracket-shaped fungal fruiting bodies attached to trunks, major limbs, or exposed roots
• Growth appearing on dead, dying, or structurally weakened wood
• Multiple overlapping brackets clustered together on a single section of bark
• Any wood that sounds hollow when tapped, which may indicate internal decay behind visible growth

Because this fungus is associated with wood decay, its presence can signal that a tree has underlying structural issues — even if the canopy above looks relatively healthy at first glance.

Not sure what you're seeing? Use the diagnosis tool to upload photos and get guidance.

For a deeper dive into biology, identification, and risk factors, visit the full details page.

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Where It's Active This November

Violet-toothed polypore is currently being tracked across 15 states, with confirmed activity reported in:

Georgia, Michigan, Pennsylvania, Massachusetts, New Jersey, Alabama, Ohio, Maryland, Minnesota, New York, North Carolina, Tennessee, Connecticut, Louisiana, and Virginia.

If you're in any of these states, now is the time to take a close look at the trees on your property — particularly older specimens, recently stressed trees, or any tree that has suffered storm, drought, or root damage in recent years.

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What to Do This Month

With this fungus rated moderate severity, it warrants a measured but proactive response. Here's what you can do in November:

🍂 Sanitation and Pruning Remove and destroy any infected branches or fallen woody debris from around affected trees. Do not compost this material. Improving air circulation by thinning dense canopy growth — where safely possible — can reduce conditions that favor continued fungal spread. Always sterilize pruning tools between cuts and between trees to avoid spreading pathogens.

💧 Soil and Moisture Management Many wood-decay fungi thrive on trees already weakened by stress. Check your drainage and avoid overwatering near the root zone. Apply a 2–3 inch layer of organic mulch around the base of trees (keeping it away from the trunk) to moderate soil moisture and reduce splash dispersal of fungal spores. Good soil health going into winter gives your trees a stronger foundation for spring.

🧴 Fungicide Application If infection is suspected or confirmed, a systemic or contact fungicide applied at the first sign of disease may be appropriate. Repeat applications can be necessary during extended wet weather. Always follow label rates and timing instructions carefully, and consider consulting a professional before applying treatments to large or high-value trees.

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When to Call an Arborist

Fungal fruiting bodies on a tree are rarely just a cosmetic issue — they are often a sign of internal decay that may not be visible from the outside. You should strongly consider contacting a certified arborist if:

• Fruiting bodies are present on the main trunk or major structural limbs
• The tree is located near a home, vehicle, utility line, or high-traffic area
• You notice cracks, lean, or crown dieback in addition to fungal growth
• You're unsure whether the tree remains structurally safe

An ISA Certified Arborist can assess the extent of any decay, evaluate structural risk, and recommend a course of action tailored to your specific tree and site conditions.

Find a certified arborist near you to schedule an inspection before the holiday season.

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Stay ahead of seasonal threats all year long with TreeIssues.com's seasonal forecast — updated monthly for your region.