Red Trim
when is best time to trim red oak tree?
Best time to prune red oak is on the coldest day of the year. In Chicago that would be in Feb. because fungus/diseases and insects are not active. Now, Red Oak is very susceptible to Oak wilt. Oak wilt is a bacteria carried in the saliva of a beetle that feeds on the sap of Red Oak. If your area has Oak wilt & you prune in May, June or July (when this bug is active), then you run the risk of Oak wilt. Oak wilt will kill a Red Oak in one season. Like Dutch Elm disease, Oak wilt can be spread from one red Oak to the next if they are close enough to have root grafted (very common in Red Oaks as in Elms). Oak wilt will take out an entire stand of Red Oaks that are all root grafted together. So extreme care must be exercised when pruning Red Oak and you have Oak wilt in your area. You can prune again in fall when red oak is going dormant (leaves are changing color or dropping). So prune any time from October thru April if in the Northern hemisphere, you have Oak wilt in your area & you have cold winters.
Black Red Trimmed Armor Sketch – Runescape