On 29 Jun 2012, at 11:13, Ian Brewster <Ian.Brewster@xxxxx.gov.uk> wrote:
Sounds like you may already know a bit about this method of
determining tree vigour. Does it matter at what age the leaf has to
be to provide an accurate measure. I guess the leaf would accrue
more tannins, xanthocyanins etc; later in the year which may scupper
results or in fact earlier/Spring where the leaf is more water and
less green pigment.
Chlorophyll Fluorescence was discussed by Glynn on Wednesday to
determine health of Horse Chestnut to demonstrate how repeated
affections by HC leaf miner reduced vigour.
Hi Ian
Good question, which I don't know the answer. However, I'm hoping for
a reply from Dr Glynn Percival.
I'm supposing when subsequent assessments are undertaken and these are
done at the same time of year, this would highlight if the assessed
trees are declining.
However for one of assessments timing may be crucial for accurate
results.
Cheers
Moray
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