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<p>The Tree Health Diagnostic and Advisory Service (THDAS) at Forest Research provides
advice and where possible diagnosis and identification of tree pests and pathogens.
The Forestry Commission has developed TreeAlert, an online tool to help gather information
about the health of the nation's trees, woodlands and forests, which allows individuals
to report any suspected tree pests and diseases. Over half of the enquiries received
at THDAS come through TreeAlert. The rest of the enquiries come via email, letter,
telephone or visitors.</p><p> </p><p> </p><p> </p><p>From 2015 to 30 September 2018,
THDAS identified 1820 cases of notifiable trees pests and diseases. Of these, ash
dieback and oak processionary moth were the most frequently reported notifiable pests
and diseases. The reports received included a range of different tree species affected
by pests and diseases.</p><p> </p>
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