My willow was planted a few years ago and was doing well. I cut off some dead branches last year. This year in early spring I cut off more dead branches. It started to grow some new leaves and was looking like it would fill in nicely. We went away for a few days and all the new leaves were dead. The trunk and branches have these little bumps all over it. Is there any hope for this tree and should I cut it down?
Your poor tree. I do not know the cause of the problem, but the folks at Cornell Cooperative Extension can probably help you. There are a number of offices in your area, and county agents are knowledgeable about pests, diseases, and problems in your area. I do hope this will be of use to you.
@Philanna Hi Phyllis. 
