I have recently moved into the house in southern Ontario, Canada, where in the backyard is this large maple tree. It believe it's a silver maple, though not sure. I was pruning some branches the other day and observed this large split in the bark, facing south direction. From reading around it seems like it's called sunscald. While I have found information about prventing sunscald, I haven't found much information about what to do afterwords. The damage might be quite old, I have no idea. This large exposed area looks susceptible to disease and insects. I can already see tiny holes in the exposed wood as if made by insects.
The tree looks healthy thus far and I would like to know if I can help it any way stay that way.