UKTC Archive

RE: Chitalpa x tashkentensis

Subject: RE: Chitalpa x tashkentensis
From: Rupert Baker
Date: May 21 2020 17:05:36
Re Xylella - 
If there is any chance that they are or could be carriers, they should be 
avoided at all costs!
We have had too many horrible plant pandemics - as well as the current 
mammalian one - to want any more, just to 'get away from Rosaceae'

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Jerry Ross
Sent: 21 May 2020 16:26
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Chitalpa x tashkentensis

What do we all make of this, from Wikipedia:

"× Chitalpa is dry-spell tolerant and fast-growing (some meters or several 
feet a year to 6–9 m or 20–30 ft) and blooms between late spring and late 
fall.[4] Cultivars include: 'Pink Dawn' with pink flowers, 'Morning Cloud' 
with white and pale pink blooms, and a recent addition, "Summer Bells 
Minsum." It a deciduous tree, branching readily near its base and with 
ascending branches that form a dense, broad oval crown. It is also highly 
drought-resistant, a trait inherited from the desert willow. Chitalpa are 
also carriers of the Xylella Fastidioas .....
...Two types of trees called Chitalpa were created as hybrids by A. 
Rusanov of the Botanic Garden of the Uzbek Academy of Sciences in Uzbekistan 
(then part of the Soviet Union) in 1964. They were introduced in the US by 
Robert Hebb of the New York Botanic Garden in 1977.
Unbeknownst to the scientist, the Chilopsis used for the hybrid was infected 
with the virus Xylella Fastidiosa. Due to the fact that all Chitalpas today 
were bred from the original root stock, all species have the virus."

Apart from the spelling error and the apparent confusion between bacterium 
and virus, can it be that all plants of this species, which are currently 
widely available, are all infected with Xylella??






On 21/05/2020 16:08, Bill Anderson wrote:
Pete Thurman pointed out to me some years ago, that catalpa needs a 
lot of sunshine, hence it does OK in the southeast, less so in less 
sunny bits of the UK. Up here in Sheffield, it struggles to get to be 
much more than a big shrub. That said I've seen a couple flowering in 
the last couple of years, so I don't know whether that's telling us 
something about the climate.
Curiously if you head further east from here towards Humberside you'll 
see better Catalpas; I found a good one in Hatfield, which is 
northeast of me but still in Doncaster. The locals in Doncaster know 
the climate's better out east. Spurn Head despite sticking out into 
the permanently near-frozen North Sea always seems clement as well. At 
least whenever I've been there.
The online photos of Chitalpa (with which I'm completely unfamiliar) 
don't make it look like a good street tree.

On Thu, 21 May 2020 at 13:28, Philip Wilson <philip@xxxxxx.com> wrote:

Jerry, I notice from your OSU link that, presumably in the US:

'Clone no. 1 of the cross was named ‘Pink Dawn’, it is the most 
commonly sold selection.  ‘Morning Cloud’ (Clone No. 2) is also 
available; it has pale pink to white flowers, is more upright, and 
grows larger than ‘Pink Dawn’'

Bearing in mind that Catalpa is a big tree (I notice also two 
subspecies and various cultivars of Chilopsis), and that tree 
breeding in Tashkent was no doubt for Uzbek conditions, perhaps 
there's scope for breeding our own cultivars - if that hasn't been done 
yet.
Philip


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:
uktc-request@xxxxxx.tree-care.info] On Behalf Of Jerry Ross
Sent: 21 May 2020 12:59
To: UK Tree Care
Subject: Re: Chitalpa x tashkentensis

Same here - ours is a bit younger and about the same (3m) high, but 
multi-stemmed and distinctly more shrub- than tree-like.
However Barchams seem to be able to train them up:
https://www.barcham.co.uk/products/chitalpa-summer-bells/ - And they 
do well in the States (see attached - from Oregon 
https://landscapeplants.oregonstate.edu/plants/chitalpa-tashkentensis
-pink-dawn
)
Barchams say it's "hardy to the UK climate and best planted with a 
sheltered aspect, in full sun", although ours has tended to be 
knocked back by late frosts.



On 21/05/2020 11:39, Topher Martyn wrote:
I've got one here, which is about 10 years old, and only about 3m high.

For me its more bushy/shrubby than upright.

Topher

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info> On Behalf Of Brewster, Ian
Sent: 21 May 2020 11:25
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Chitalpa x tashkentensis

There is a consideration to plant a varied mix other than typical
ornamental Rosaceae varieties to try and build resilience within our 
exiting Highway tree stock. The ‘Desert Willow’ is being considered 
and wondered if anyone had experience of it, for example will it 
reach heights to accommodate the average vehicle size and tolerant of 
urban life/environment, as a street tree?
There is a consideration to plant a varied mix other than typical
ornamental Rosaceae varieties to try and build resilience within our 
exiting Highway tree stock. The ‘Desert Willow’ is being considered 
and wondered if anyone had experience of it, for example will it 
reach heights to accommodate the average vehicle size and tolerant of 
urban life/environment, as a street tree?
NPS




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The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/