----- Original Message -----
From: Burke Nick (DEL)
To: UK Tree Care
Sent: Thursday, December 27, 2007 8:49 AM
Subject: Ash dieback
I have been to look at an ash tree, directly next to a dirt track to some
housing which was built within the last 30 years, with severe die back in its
crown. I know ash dieback is considered to be caused by ploughing in fields
close to hedge row trees but would soil compact cause the same problem
SC Seems a logical analog. But in both cases an "abiotic" problem or a
"people pressure disease (PPD)."
SC In NE US over the last 30 years at least thare has been a problem with
large, mature ashes that is generally described as "ash decline" and includes
the phyiscal condition of dieback. Dr. Craig Hibben had isolated a
mycoplasma consistently associated with the condition, but there were
implications of climate change, pot smoking under the trees by wayward youth,
acid rain.......... I guess the point is to separate possibel casues, with
abiotic and more infectious or pathogenic problems being the two big classes.
Scott Cullen
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