Prune the tree as soon as you notice the problem. Ideal tree-pruning season is late winter, when the trees are dormant, though emergency pruning takes place year-round. Set out a plan of action beforehand and move all valuables from under the tree.
Don gloves to protect your hands. Cut foliage and smaller branches from the end of the widowmaker limb. Be careful not to pull the limb or its foliage down on yourself. This thinning process makes the final cutting easier and less dangerous.
Cut the main widowmaker limb into pieces if it is over 10 feet long. Cut 5- to 6-foot sections at a time for a more manageable process and make the final cut 1 to 2 inches from the main trunk. This spacing gives the tree room to heal.
Sprinkle cinnamon over the wound to encourage healing and watch the area for signs of infection.