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You should not trim an oak tree in the summer. Oak trees are especially susceptible to disease, and open tree wounds are an invitation for beetles that carry tree-killing fungus. If there’s no risk that the oak tree will do damage to your property or hurt someone, it’s best to save the trimming for fall or winter. If you can, seal the wound with latex to prevent fungus from getting inside.

Though summer is not ideal, you can do some light pruning during this time of year. Just make sure it’s not excessive. Vigorous pruning will stress the tree and impact next year’s growth. Generally, August to September are the best summer-pruning months, particularly for fruit trees.

If you’re wondering why tree trunks are painted white in your area, it’s usually to prevent sunscald, a condition where extreme shifts in temperature can cause tree bark to split. Fruit trees are especially vulnerable to sunscald, so this treatment is worth considering if it’s something that affects your trees.

Your local government is usually in charge of pruning trees on public property, and the power company is responsible for trees near power lines (even if they’re on your property). Whether or not they top these trees depends on their approach to pruning. You won’t be able to do much to control this, but you can contact them to find out more about their pruning process.