Without knowing more about your trees my first thought is that the tree shown may be heading towards the end of its life and the aging trunk has become susceptible to fungal attack ... all part of the natural scheme of things ... but I’m just a gardener and not a tree expert ... someone else may know better ...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I'm not a tree expert either, but google came up with 'white crust lichen' which looks similar. I found a pic here no idea if that's what it is though..
Billericay - Essex
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
Ah ... yes White lichen ... I’d forgotten about that ... told you I’m not a tree expert ... love lichens and should’ve remembered that tho ... obviously too early in the morning and not enough caffeine on board ... sorry if I alarmed you
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
In the sticks near Peterborough
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
'You must have some bread with it me duck!'