UKTC Archive

Re: Walnut tip damage

Subject: Re: Walnut tip damage
From: Tahir
Date: May 19 2020 10:33:02
I'd say it's frost damage. Ours were leafing out way earlier than normal I guess because of the warm spring and have definitely been hit hard by the frosts, looks like no nuts this year!

Tahir

On 19/05/2020 11:28, Kevin Slezacek 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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