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No leaf miners in the Lake District.
We had lots of active bleeding cankers in the drought of 2003 but their
incidence appears to be subsiding and many appear to be inactive at present.
Some of the worst affected trees now have strips of exposed sapwood that form
as a result of the radial growth either-side the strip of dead bark that
causes it to crack and fall from the tree. These strips of exposed wood are
becoming infected by decay fungi including Jew's Ear. With regard to
shedding branches I've seen a few infected branches that have broken from
trees that don't appear to be infected by decay fungi. I'm not sure exactly
what the mechanism is but it may be something to do with localised
desiccation of tissues causing an imbalance in the internal mechanical
stresses within the affected limb. The breakages appear to be based on the
location of the cankers rather than 0.5-2m from the base of the branches as
sometimes stated with SBD. Any further information would be appreciated.
Regards
Luke Steer
Chartered Forester - Arboricultural Consultant
Treescapes Consultancy Ltd.
Melbourne
17 Millans Park
Ambleside
Cumbria
LA22 9AG
Tel/Fax: 015394 34698
Mobile: 07734 113964
Email: luketreescapes@xxxxxxxxxxx.com
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