Honey Fungus UK

Honey fungus is the common for the Armillaria fungus, which can damage and kill the roots of numerous trees and perennial plants in the UK.

How to identify and manage Honey Fungus UK

The most apparent indicators of Honey fungus in trees are the mushrooms with a honey colour that show up in autumn and the white fungal growth between the bark and wood found at the base of the plant.

Several honey fungus species exist in the UK. The most common ones are Armillaria mellea, gallica and ostoyae (also called Dark Honey Fungus). Armillaria ostoyae and Armillaria mellea cause the most damage and present the most significant danger to UK trees.

Knowing how to spot honey fungus and implement effective treatment is essential for protecting UK gardens, woodlands, and outdoor areas.

This article discusses the features of honey fungus and explains how to recognise signs of infection and prevent it from spreading.

What is Honey Fungus?

Honey fungus armillaria is a fungal disease that impacts trees and perennial plants, causing their roots and lower stems to rot.

Identifying Honey Fungus UK

To spot honey fungus on trees, keep an eye out for these signs:

Above-ground symptoms of Honey Fungus

• Splitting and oozing of bark at the stem’s base
• Leaves that are smaller and paler than usual
• Early autumn colouration
• Dieback of the upper sections
• Lack of flowering or unusually heavy blooming followed by an exceptionally large fruit crop (typically just before the plant’s demise)

Below-ground symptoms of Honey Fungus

• A clear sign of honey fungus is the presence of rhizomorphs in the soil around these plants. People often call these tough, root-like structures “black bootlaces.” They help the fungus spread through the soil, sometimes reaching up to 30 meters from where the infection started.
• If you peel back some bark at ground level, you might see white sheets of fungal mycelium growing between the bark and wood.
• You will also find white rot in the roots and stem base.

What do Armillaria Honey Fungus Mushrooms look like?

You can identify Armillaria fugus mushrooms by looking for these key features:

1. Cap: Honey-beige to brown in color smooth surface but can be a bit fluffy, measures 5-15cm across.
2. Gills: Light-colored, spread out like spokes under the cap. Some gills stretch from the edge of the cap to the middle stem.
3. Stipe (stem): Often thick and firm, starts out light but gets darker as it ages. It might have scales and feel .
4. Annulus: A band of tissue wraps around the stem near where the cap starts, though it can be hard to spot.
5. Spores: Light (white or cream) in colour; they appear as fine powder on the lower mushrooms in a group.

Keep in mind that honey fungus mushrooms might only show up some years, and their absence doesn’t mean there’s no infection. Also, the genetic differences found in honey fungus samples point to the idea that spores from these mushrooms might have a bigger impact on spreading the fungus than we used to think.

How to treat Honey Fungus UK

Dealing with honey fungus in UK gardens and outdoor areas is a big problem, as there’s no sure-fire way to get rid of it . But you can use a few tested and approved ways to control how it spreads and reduce its effects.

Chemical Control

At present, there are no chemical treatments that experts recommend to control Honey Fungus in the UK.

Physical Removal

Physical removal is the best way to control honey fungus in the UK. Physically removing infected tree and plant matter prevents the fungus from spreading to healthy trees and plants.

Here are some key strategies to remove honey fungus :

• Remove infected trees and plants: Remove and dispose of all dead or diseased trees and plants.
• Dig out infected roots and stumps: As roots and stumps can harbour honey fungus, thoroughly dig them out and dispose of them responsibly. Stumps can also be ground out with a stump grinder, but be sure to dig out the soil afterwards.
• Remove the contaminated soil: Replace contaminated soil from honey fungus trees with fresh soil when you can. If you must leave infected matter in the ground, hold off on planting for a year to avoid cross-contamination.
• Root barriers: Install vertical root barriers between infected and healthy areas. These barriers should extend from just above the soil surface to at least 45 cm underground to prevent rhizomorphs from spreading.
• Trench digging: Dig trenches between sick and healthy plants, cutting rhizomorphs to shield plants that might get infected. You may need to do this several times a year until the infected stump has completely rotted away.
• Garden hygiene: Avoid leaving things such as dead trees and plants in the garden that honey fungus could feed on
• Replanting considerations: To replant in affected areas, pick tree species less susceptible to honey fungus and plant them at the correct depth. Taking away some soil from around the bottom of plant stems can also help trees stay healthier.

While completely eradicating honey fungus will never happen, these hands-on removal methods can significantly limit its spread and shield UK trees from further harm.

Trees Resistant to Honey Fungus UK

Another way to help control the spread of honey fungus is to plant more honey fungus resistant trees. Trees resistant to honey fungus include Mimosa, Yew, Bay Laurel, Ginkgo, Olive, Indian bean and Mulberry trees.

Other trees rarely affected by honey fungus are the Common Pear Tree, Crepe Myrtle, Zelkova, Silk and Strawberry trees.

Honey Fungus North London

Honey fungus is prevalent throughout North London, particularly in areas such as Hampstead, Highgate, Muswell Hill and Crouch End. As qualified North London Tree Surgeons, we can quickly identify Honey Fungus and provide any necessary treatment.

If you require further assistance identifying honey fungus or want a honey fungus-infected tree removed in North London, contact us today.

We have some of the most knowledgeable arborists and tree surgeons in North London who are ready to assist you with tree fungus, pests and diseases.

If you want to learn more about UK tree fungus and tree fungus identification, we recommend visiting the Woodland Trust website.