What Is Ganoderma Rot – Learn How To Control Ganoderma Disease

Ganoderma Rot
(Image credit: Scot Nelson)

Ganoderma root rot includes not one but several different diseases that could impact your trees. It includes root rots caused the different Ganoderma fungi that attack maples, oaks, and honey locust trees, among others. If your landscaping includes these or other deciduous trees, you’ll want to learn about Ganoderma symptoms so that you can quickly identify trees attacked by Ganoderma disease. Read on for info on the Ganoderma fungus.

What is Ganoderma Rot?

Many people have never heard of Ganoderma root rot and wonder what it is. This serious rot disease is caused by a Ganoderma fungus. If you have deciduous trees in your yard, they may be susceptible to attack. Sometimes conifers are vulnerable to Ganoderma disease as well. If one of your trees has this disease, you will see definite Ganoderma symptoms, which causes the decay of the heartwood. The leaves may yellow and wilt and entire branches may die as the decay advances. Look for fruiting bodies that resemble little shelves on the lower trunk. These are conks and generally one of the early Ganoderma symptoms. The two main types of Ganoderma root rot fungus are called varnished fungus rot and unvarnished fungus rot. The upper surface of varnished fungus rot looks shiny and is usually a mahogany color trimmed in white. Unvarnished fungus rot conks are the same colors but not shiny.

Ganoderma Root Rot Treatment

If you learn that your trees have root rot from seeking the conks, unfortunately, there’s really nothing you can do to help. The heartwood will continue to decay and can kill a tree in as little as three years. If a tree is stressed in other ways, it will die sooner than vigorous trees. The Ganoderma fungus will ultimately damage the structural integrity of the tree, when strong wind or storms may uproot it. You won’t find anything available in commerce to control this type of disease. Use the best cultural practices to keep your trees as healthy as possible, and avoid damaging trunks and roots when you work in the yard.

Teo Spengler

Teo Spengler has been gardening for 30 years. She is a docent at the San Francisco Botanical Garden. Her passion is trees, 250 of which she has planted on her land in France.