We just planted fruit trees this past winter, and it took quite a while for them to start showing signs of life. They started leafing out well after everything was already green. I agree with trying the "bend" test, if the tree is still alive it will have some spring to it. Make sure you're giving lots of water and you should be fine! Most nurseries will also have some sort of warranty. Ours will give us a new tree within the first year if it dies.