From the BBC Website ...
A year after the first case of ash dieback in wild trees in Britain, the disease has now spread across much of England, Wales and Scotland. The public is being asked to be the "eyes and ears" of the countryside amid concern about new global threats that could spell disaster for forests.
In a London park, forester Simon Levey is checking a moth trap strung high in the canopy of an oak tree. He is searching for signs of the oak processionary moth, which is present in parts of the capital and Berkshire. When the moth's caterpillars emerge from their nests, they can strip oak trees bare and harm human health.
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