Posted: 21/06/2014 at 16:00
The first picture looks like suckers growing up from the roots of your cherry tree. the best thing to do is just to keep mowing your lawn regularly as if you try to dig them out it will stimulate the roots to send up more suckers, and if you use a weedkiller the poison will travel back through the roots and kill the tree.
The second picture looks like a hypericum seedling or sucker. I'd either lift the turn around it and dig it out, replacing the turn and filling in any hollow. Or alternatively you could carefully paint the leaves with some glyphosate weedkiller and leave the plant to die back.
I'm not sure what's wrong with your pear tree leaves - I'm wondering if it might be the after effects of an aphid infection. Someone else may know better but I don't think it's anything to get too anxious about.
Hope that's helpful