How can I effectively prevent and remove mold on an oak tree?

To effectively prevent and remove mold on an oak tree, you can start by ensuring proper air circulation around the tree and avoiding overwatering. Prune any dead or diseased branches, and clean up any fallen leaves or debris that can harbor mold spores. If mold is already present, you can gently wash the affected areas with a mixture of water and mild soap. Consider consulting with a professional arborist for further guidance on treating mold on oak trees.