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In Merton (another first for the Borough - here's where Cameraria ohridea was
first found in the U.K.! - swells with pride) it is on many but not all HCs.
It can be all over one and very little on an adjacent tree. No apparent
connection with other problems - i.e. does not appear to be worse on stressed
trees. The one thing I have noted is the intensity on lower crowns over
tarmac, footways , etc, rather than grass - is perhaps a greater amount of
radiated/reflected heat benefitting the insect?
Dave
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