Question: What causes my red oak’s and bur oak’s leaves to lose all their color? It almost looks like something has bleached out all the tissues except the veins.

Answer: That’s probably the work of sawfly larvae. They will skeletonize the entire top surface of each leaf. They work in patches, so you may see their damage scattered randomly over the entire canopy of the tree. If you decide you need to treat, a general-purpose insecticide will help, but they are not life-threatening to the tree.