Apparently our hillside trees sustained considerable damage in an ill-timed hailstorm, and the virus was able to enter the trees. I am not sure if this is right or not, as I have watched the trees becoming infected over a couple of years. But as none of my neighbours seemed to be worried, I didn't worry about it either, and simply removed the worst affected branches. But this year I am feeling ruthless!
This is not a bark-less tree though; apart from having two little woofers who run about under it, it still has most of its bark under the paste that has been applied.
Maybe I will post more progress photos in a few days. Right now I am imagining lovely summer breaks under the trees, with friends enjoying my lovely hillside. :)