Pruning trees for years I have always done it whenever, and I did have some problems. This is a very important time frame. Some trees are more affected than others. so check before you prune.
Via William Feela Realtor 651-674-5999 No. Branch,MN (WHISPERING PINES REALTY)
In our area of Minnesota, Oak wilt is a devastating disease that affects the red oak family. We have been told for many years not to cut down or prune these hardwood in June and July.
Well, with the early spring we are having, that pruning should stop closer to the middle of may this year. Pruning for most trees should stop around that time. Leaving an open wound in a tree invites insects to move in and can have adverse results on your trees.
Check with your local DNR station about time lines for pruning in your area!