Advice Please on Peach Leaf Curl Disease and Treatment

My neighbour planted a bare root Peach against a South facing wall in November.
It seemed to have taken well to the replanting and has been growing buds and shoots
and gave him a spendid show of blossom.
He knows about  not letting the plant fruit in the first year while making root, but before
he could clip off the fruitlets it developed a very serious case of peach leaf curl.
Ninety percent of leaves affected each being shrivelled with angry red pustules.
The remaining ten percent appeared to develop the disease an hour after removing and
burning the original affected leaves.
My understanding is the the plant will throw up new leaves, but at present it is back to
bare branches.
The tree is a 3-year old plant but no varietal name came with it from the local supplier.
I believe that treatment for PLC follows a preventive rather than curative practise using
Bordeaux Mixture or Dithane.
MY fear is the plant will die unless it can grow leaves and is vulnerable because it has little root growth yet.
Can anybody please how best to treat the plant so as to save it?
I told my neighbourI would ask the forum as somebody out there is bound to know the best course of action.

TIA

Peach leaf curl comes in on wind and rain and once it hits it's really difficult to get rid of. Gather up all the fallen leaves (and there'll be many) and bin or burn them. Give the tree a really good feed right now with a manure slurry or fish emulsion and water this in well. Keep picking up fallen leaves and dispose. There'll soon be a 2nd flush of leaves once the feeding reaches the roots and you'll get your cropping. If the peach fruit looks to be a heavy  crop, thin by half to reduce the stress on the tree.

The fungus doesn't kill the tree, just makes a terrible mess of the leaves. You can spray your bordeaux mix every fall or spring well before budding to try to minimize the damage, or a lime oil and sulphur spray.

excuse my ignorance but what is bordeaux mix?

Bordeaux mix is an anti-fungal thing made from copper sulphate. Presumably originally developed in vineyards.
You can also use a synthetic fungicide called Dithane which is sometimes easier to get hold of.
I think spraying now would be beneficial - I was eyeing my plum tree on Sunday and thinking that. Trillium's advice about feeding is also very sound.