Nectria sp. etc. on red oak

[treeseer]

Nectria popping out in fissures, do not know what tan flaky stuff is.

 

Host is red oak, maybe rubra.

[Tony Croft aka hamadryad]

tan flaky stuff stereum sp

[treeseer]

tan flaky stuff stereum sp

Does Nectria typically pop up in fissures in the UK? And is it generally a weak parasite? Fungus I believe said that it never invades live wood. I've seen it enter live branches with no outward sign of other pathogens paving the way, but then again I am not looking as closely as he is!

[Fungus]

1. Does Nectria typically pop up in fissures in the UK? And is it generally a weak parasite?

2. Fungus I believe said that it never invades live wood. I've seen it enter live branches with no outward sign of other pathogens paving the way,

3. but then again I am not looking as closely as he is!

 

1. On the European continent, no. Besides, which Nectria species are you referring to ? Not the species living on rotting Polypores (N. peziza), on Pyrenomycetes (N. episphaeria) or cow excrements (N. suffulta), I presume ?

2. I said Nectria cinnabarina is restricted to twigs and branches and never invades (the living tissues of) the stem or trunk (see the photo of Nectria cinnabarina and its anamorph Tubercularia vulgaris).

3. True, I use a microscope to ascertain which Nectria species I'm dealing with - for which one needs the teleomorphs - before I diagnose and assess the effects on the tree that can be attributed to the microscopically identified species.

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[treeseer]

Thank you very much!