Ash dieback has been in the UK for more than a decade and is most visible when the trees are in leaf.
The Woodland Trust says the fungus, which originated in Asia, overwinters in leaf litter on the ground.
It says when the spores are released they can blow tens of miles away, landing on the surface of leaves and then penetrating the tree.
The fungus then grows inside the tree, eventually blocking its water transport systems, causing it to die.
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