Can I save my Rowan tree? - holes and spots problem

Hello all New member here with a problem..
I've noticed a hole in the trunk of our Rowan tree. It looks like a
young tree, the hole is not too deep but is quite sizeable for the
trunk. I have poked around and some fine soil and a few black ants came
out which seem to run up and down the tree. I've noticed the Rowans
do tend to have peeling bark etc but I haven't seen one with holes.
Should I leave it and hope it heals or can it be patched?
To top it off I noticed a few silvery/ white spots on the leaves which may or may not be related. Any ideas of cause & treatment?
I am worried that the tree may be beyond saving & it is the only thing of interest in our garden at the moment!
Advice greatly appreciated. Thanks in advance, Della :-)
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I wondered if taking off some of the top growth might take the load off it a bit but I'm sure I've read they don't like to be pruned.
However, if the leaves are diseased too as a separate issue then there may be no point.
The hole on the trunk doesn't look good, but I'm more concerned with the crack much lower down the trunk, I don't think you can do much with that. You simply have to wait. Any form of canker is not good but also unpredictable depending on age of tree. But since it is quite low down on the main trunk, the tree is unlikely to last long. The droopy appearance of your tree is not a good sign. It's either suffering from that damage on the trunk and dying from within, or possibly suffering from the early stages of Fireblight.
Since it is in this condition, it is better to take a section of a branch to see what is happening. If they snap off very easily and have a reddish tone inside, it could be suffering from Fireblight.
for the fag ends of the aristocracy.
Are those Muscari leaves around it or is it grass? If it's Muscari I'd plant a multi-stemmed Amelanchier there ... it'll look a picture with it's blossom in the spring with the blue flowers below it ... I've got scilla and chionodoxa around mine for the spring, and pink Cyclamen hederafolium blooming at its feet now ... wonderful, especially with it's amazing autumn colour too
Whoops! it's on it's side and you can't see the cyclamen from there, they're behind the stripy Gardeners Garters grass but you can see how lovely the amelanchier is.
I'd agree - the rowan looks done. I also think the drooping nature is a direct result of the lower damage on the trunk. It doesn't look that great right down at ground level either...
I don't doubt you've made a, possibly only temporary, difference to your tree n.philip, but I'm not sure it's a great idea to block holes in living things with something meant for diy purposes, for the reasons doc gives
Keep us updated though.