UKTC Archive

RE: rhododendron by rivers - will seeds spread downstream in water and colonise banks lower down

Subject: RE: rhododendron by rivers - will seeds spread downstream in water and colonise banks lower down
From: Rupert Baker
Date: Jan 15 2021 14:28:53
______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD
-Philosophy of tree risk assessment. -Practical hazard identification
-Trees & decay fungi: a new approach. -THREATS
-Forensic entomology. -Decision-making & tree work for risk control
-Tree morphology & retrenchment pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics
Please email enquiries@xxxxx.uk.com to register interest
______________________________________________________________________

Thanks Tim - there is a bank of Rhodo along the edge of this river, which is 
what made me think it might have arrived via water; if the seeds came down on 
a flood, and were left on the adjacent low, occasionally inundated ground, 
they might well germinate by the sound of things....
Atb
Rupert

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Tim Moya
Sent: 15 January 2021 09:16
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: rhododendron by rivers - will seeds spread downstream in water 
and colonise banks lower down

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi Rupert - don't see why not the FC Practice Guide suggests that dispersal 
can occur over fairly large distances by wind, on animal hair, on the 
clothing of volunteer workers (not sure why the volunteers have been singled 
out) and in mud on vehicle tyres. Water dispersal seems a logical 
possibility. I suppose the evidence would be prolific growth of new plants on 
the river bank (or, alternatively, lack of this evidence). However the guide 
also states that suitable substrate is fairly essential to successful 
germination and it seems that a consistently moist environment is required 
(old tree stumps / moss / woodland soil). This may exist on some river banks 
but perhaps not generally.
Pictures like this suggest that it is at least a possibility 
https://www.flickr.com/photos/sunnyjim36/415451474/

Tim Moya
-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Rupert Baker
Sent: 14 January 2021 20:03
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: rhododendron by rivers - will seeds spread downstream in water and 
colonise banks lower down

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi All,

A query re Rhodo ponticum - as it says in the subject line.  Anyone any ideas 
- scenario, river bank - upland, fast-flowing in winter; big variation in 
levels winter-summer, flowing off through/off Dartmoor - acid sandy clay 
granite-derived soils - what is the likelihood of seeds from the ponticum 
spreading downstream - in the way eg hemlock, hogweeds, or Himalayan Balsam 
do?  Any observatins most useful

 

Atb

Rupert




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