UKTC Archive

Ganoderma valesciacum - Yew

Subject: Ganoderma valesciacum - Yew
From: Biddle, Mick
Date: Dec 12 2008 11:38:59
Further to my postings back in October, the AAIS analysis of the
attached photographed brackets gave the following information:

"The fungus on the Yew (Taxus baccata) is an example of Ganoderma
valesciacum. This species of Ganoderma occurs primarily on conifers
especially Taxus and is very similar to G.resinaceum. 
Ganoderma valesciacum typically grows in the form of a bracket whereas
the fruit body of G.carnosum invariably has a distinctive stalk. 
Both species can cause decay which can lead to stem failure and
breakage. However, little is known about the actual decay processes and
so it is difficult to predict the rate and extent of decay within the
stem."

Since that response, the tree has been investigated with a resistograph,
and the readings do indicate an area of heartwood decay in the vicinity
of the brackets on one of the two main stems.

As well as monitoring the tree's condition, comparing the vitality of
the two main stems for signs of variation, the growth pattern of the
fruiting body will be monitored to assess the amount of resource
available to the fungi in spring and late summer. A further resistograph
investigation is being undertaken in 2010 to compare the readings.

Mick Biddle
Trees & Parks Officer
Fareham Borough Council
www.fareham.gov.uk
01329 XXXXXX



-----Original Message-----
From: Biddle, Mick [mailto:MBiddle@xxxxxxxx.Gov.UK] 
Sent: 08 October 2008 16:07
To: UK Tree Care
Subject: Ganoderma carnosa?

About time I broke my UKTC duck with a plea to your collective
experience...

 

These brackets found on the north side of one of our large low-spreading
churchyard yews about 3m up the stem. 

 

From the position and appearance of the brackets, it would appear that
I'm looking at Ganoderma carnosa - does anybody have any experience
managing yews with this fungi present? Or does anyone have any other
ideas as to what it may be? I'm intending to send a sample to the AAIS
for identification.

 

This is the first time I've seen brackets on any of the yews in the
churchyard. A large limb from a similar yew in the same location failed
at about 4m earlier in the year with an extensive white, wet, soft rot
being the cause. A sample of material was sent to AAIS, and the results
concluded that the sample had degraded too much to be sure, but it was
likely to be a Ganoderma spp.

 

The only other bit of info I can find on the net about this particular
species is here <http://www.ancient-yew.org/rareganoderma.shtml>  - the
other findings also seem to have tended to be in the South East. Has
anybody seen this fungus further afield?

 

Many thanks

 

Mick Biddle

Trees & Parks Officer

Fareham Borough Council

www.fareham.gov.uk <http://www.fareham.gov.uk> 

01329 XXXXXX Ext 4606

 



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