Laurel Wilt: A High-Severity Threat to Trees in the Laurel Family

> Severity: HIGH — Laurel Wilt is a lethal disease with no cure once a tree is infected. Early identification and preventive action are critical.

If you live in the southeastern United States and have redbay, sassafras, or avocado trees on your property, Laurel Wilt is one of the most serious threats you should know about. This aggressive fungal disease has already devastated native tree populations across the coastal plain, and it continues to spread. Here's everything you need to know to protect your trees.

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What Is Laurel Wilt?

Laurel Wilt is a lethal vascular disease caused by a fungus that attacks trees in the laurel family. What makes it especially dangerous is how it spreads: the disease is vectored — meaning carried and transmitted — by the redbay ambrosia beetle, a non-native insect that introduces the fungus directly into a tree's water-conducting tissue as it bores in to create its galleries.

Once inside, the fungus disrupts the tree's vascular system, essentially cutting off its ability to move water from roots to leaves. The result is rapid decline and, in most cases, death within weeks to months of the first visible symptoms. There is currently no known cure for an infected tree.

For the full scientific breakdown of this disease, visit our full ailment details page.

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How to Identify Laurel Wilt

Laurel Wilt identification can be straightforward if you know the warning signs. The symptoms are distinctive and tend to progress quickly:

• Rapid wilting and browning of foliage — Leaves turn brown and wilt suddenly, but crucially, they remain attached to the branches rather than falling. This "flag" of dead, clinging foliage is a hallmark sign.
• Dark streaking in the sapwood — If you cut into a branch or the trunk, you may see dark discoloration in the wood just beneath the bark. This is the fungus disrupting the vascular tissue.
• Tiny beetle entrance holes with frass tubes — Look closely at the bark for pinhead-sized entry holes surrounded by small, toothpick-like tubes of compacted sawdust (called frass). These are left behind by the redbay ambrosia beetle as it bores into the tree.
• Rapid death — Unlike many tree diseases that linger for years, Laurel Wilt can kill a tree within weeks to a few months of symptom onset.

If you notice any of these Laurel Wilt symptoms, time is of the essence. Use our diagnosis tool to document what you're seeing and get guidance on next steps.

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Where Is Laurel Wilt Spreading?

Laurel Wilt is currently confirmed across a broad swath of the southeastern United States. Affected states include:

Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Texas, and Virginia.

The disease has been particularly devastating to redbay populations in the southeastern coastal plain. Beyond redbay, it also threatens sassafras trees and cultivated avocado, along with other species in the laurel family. If you are in any of these states and grow susceptible trees, you should consider your landscape at risk.

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Laurel Wilt Treatment Options

It's important to be honest here: there is no cure for Laurel Wilt once a tree is infected. However, there are two important management strategies available.

1. Propiconazole Preventive Injection For high-value sassafras or avocado trees that are currently healthy, a preventive macro-infusion of propiconazole fungicide into the root flares can provide partial protection for 1–2 years. This is a preventive treatment only — it will not save a tree that is already infected. If you have specimen trees or commercially valuable avocados, talk to a certified arborist about scheduling preventive injections before the disease reaches your area or your property.

2. Sanitation Removal of Infected Trees When a tree is confirmed infected, the most responsible course of action is prompt removal and destruction of the infected material. This reduces the available breeding habitat for the ambrosia beetle and limits the spread of fungal inoculum to neighboring trees. It is also important to cover stumps after cutting, as freshly cut wood can attract ambrosia beetles and accelerate local spread.

Neither of these options is a silver bullet, but together they represent the best tools currently available for Laurel Wilt treatment.

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When to Call an Arborist

You should contact a certified arborist as soon as possible if:

• You notice wilting, browning foliage that remains on the branch
• You find small beetle holes or frass tubes on the bark of a laurel-family tree
• You have high-value sassafras or avocado trees and want to discuss preventive injections
• You are unsure whether a declining tree poses a safety hazard

Because Laurel Wilt progresses so rapidly, waiting is rarely the right choice. A professional can confirm the diagnosis, advise on removal logistics, and help you protect nearby healthy trees.

Find a certified arborist in your area who is experienced with Laurel Wilt and other vascular diseases of southeastern trees.

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Laurel Wilt is a HIGH severity threat. If you suspect infection, don't wait — early action is the most effective defense you have.