From Newsgroup: uk.rec.gardening

I wonder what this is...

We've got a small maple tree (don't know precise one) at the bottom of
the garden. It's been suffering a bit with dieback.

I've just been cutting off the dead bits.

Through one of the twigs, perhaps 15mm in diameter, is a burrow about
4mm in diameter. It's not in the centre, but just under the bark. It
looks to me as if some sort of beetle has burrowed along there, eating
as it goes. There's a long scar on one of the still not dead branches
that looks as though it could be the same thing, but the bark above it
has died.

Some bark beetles carry a fungus with them which kills bits of the tree
- I'll guess it's one of them, but which I have no idea.

Andy
--
Do not listen to rumour, but, if you do, do not believe it.
Ghandi.
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From Newsgroup: uk.rec.gardening

On 20/05/2025 16:59, Vir Campestris wrote:

I wonder what this is...

We've got a small maple tree (don't know precise one) at the bottom of
the garden. It's been suffering a bit with dieback.

I've just been cutting off the dead bits.

Through one of the twigs, perhaps 15mm in diameter, is a burrow about
4mm in diameter. It's not in the centre, but just under the bark. It
looks to me as if some sort of beetle has burrowed along there, eating
as it goes. There's a long scar on one of the still not dead branches
that looks as though it could be the same thing, but the bark above it
has died.

Some bark beetles carry a fungus with them which kills bits of the tree
- I'll guess it's one of them, but which I have no idea.

Could be a borer of the ambrosia beetle type. I hadn't heard of it, but
an internet search shows that it has been found in the UK (and related
beetles - some of which should be notified if found and identified - eg
see <https://planthealthportal.defra.gov.uk/assets/factsheets/anplophoraLonghornBeetle.pdf>).
--
Jeff
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From Newsgroup: uk.rec.gardening

On 20/05/2025 19:18, Jeff Layman wrote:

Could be a borer of the ambrosia beetle type. I hadn't heard of it, but
an internet search shows that it has been found in the UK (and related beetles - some of which should be notified if found and identified - eg
see <https://planthealthportal.defra.gov.uk/assets/factsheets/ anplophoraLonghornBeetle.pdf>).

That made me jump!

I only saw one exit hole, and it was smaller than the tunnel. Your link
says "The emergence holes formed by Asian and citrus longhorn beetles
are about 10 mm in diameter"

Whatever this is it's smaller than that - or indeed any of the other
ones mentioned in your link. Good find though, thanks.

Andy
--
Do not listen to rumour, but, if you do, do not believe it.
Ghandi.
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