UKTC Archive

Re: Walnut tip damage

Subject: Re: Walnut tip damage
From: Bill Anderson
Date: May 19 2020 12:24:49
No nuts Tahir? The squirrels will be disappointed...
That aside the frost around here last Thursday was savage, and strangely
the Fig behind my office which is on a south facing wall  was untouched,
although some stray twigs that stuck out from the wall about a metre and a
half, were nipped. (So possibly not strange at all.) Elsewhere, I had a
message from one of the local fraternity, querying something that
sounds very much like frost damage on Oak, Ash, and the bracken below.
Possibly in a hollow that would make a nice frost pocket.
Last summer's disease Paul, was probably some sort of scab. Walnuts round
here get it fairly regularly and look sick as anything by summer's end.
Might be Venturia sp.
Bill.
PS Jerry; enjoyed your piece on Poplars in the AA mag. If you're organising
another trip I'll try and make the effort. Assuming lockdown isn't banning
that sort of thing forever of course.





On Tue, 19 May 2020 at 12:04, Paul Barton <paul@xxxxxxxxxxxxx.co.uk> wrote:

Thanks Kevin (and others!),

I didn’t know about the chambered pith, thanks. Every day is a school day!

Paul.
On 19 May 2020, 11:28 +0100, Kevin Slezacek <
KevinSlezacek@xxxxxxxxxxxxx.com>, wrote:
Hi Paul

We had some cold nights last week that resulted in air frosts and Ive
noticed quite a bit of frost damage to fresh young growth. That’s what that
looks like to me? These late frosts are most damaging particularly to late
leafing species as they don’t harden off for some time.
Walnut has a chambered pith anyway so isn’t solid is that what you mean?

Kind regards,

Kevin Slezacek
-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <
uktc-request@xxxxxx.tree-care.info> On Behalf Of Paul Barton
Sent: 19 May 2020 11:17
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Walnut tip damage

Attempting to resend the below message with smaller photos.
On 19 May 2020, 11:15 +0100, Paul Barton <paul@xxxxxxxxxxxxx.co.uk>,
wrote:
Hello hive mind,

Last summer I noticed a number of common walnut trees with blackened
leaves and dieback throughout the crowns. In some cases the pith had been
hollowed out near the tips. I didn’t work out what had caused it then.

This year I’m also seeing dead black tips, but it looks very like
frost damage. See attached photo.

Is anyone aware of a particular pest or disease that would do this, or
is it simply frost? There were a couple of cold nights last week...

Kind regards,

Paul Barton
MSc, BSc (Hons), TechCert (ArborA), MArborA Registered Consultant of
the Arboricultural Association

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