Tree Disease Management - Conservation Management Plan. TD17-A

Kretzschmaria Deusta - Common Hosts & Colonisation

Beech and many other broadleaved trees incl. Oak, Lime, and Maple. Usually spores  enter via injuries to the base of a stem or through large roots.

Symptoms & Types of Rot

Perennial fruiting bodies are produced by this fungus and appear as a black, lumpy, chalk like crust that disintegrates when crushed. They form a layer close to the soil and are commonly found on buttress roots, around the base of tree trunk. The disease, when found, will persists in the area for several years. There is no means of control. The Conservation Management Plan addresses the need for preventing the spread of this disease. 


Parts of Tree Affected & Significance

Lower stem buttresses and principal roots may be affected. The development of Soft rot can lead to a catastrophic brittle failure. 

This decay type can cause failure of the tree with little or no warning. Older trees on the park have been found with this disease and have been  felled. 

This fungus is considered a particularly dangerous type of decay fungus. The fruiting bodies are sometimes difficult to spot.


There are no effective controls available on the market that are approved for use. 


Conservation Management Plan 


Historic England Listing:

Clandon Park

List Entry Number: 1001171

Heritage Category: Parkland

Grade: II

Location: 

Clandon Park Estate, West Clandon, Guildford, Surrey



All photographs are reproduced by kind permission of the Countess of Onslow.