Stain removal suggestions needed

[denzjos]

The best way to do this is to reconstruct the trees. Take the color with the pencil from the tree on the left (shift click) and paint with something like Bristles 02 with the Dynamics 'Fade Tapering'. Use different green colors and when you are happy, blur the result a bit (Filters / Blur / Gaussian Blur). Be an artist!  An easy way is to search for a similar tree in the internet and paste it on the photo. I did the first way.