This is not a disease but the result of too much sun, often combined with lack of water. In the maple family, it most commonly affects Japanese maples. Every year the leaves become brown as well in the summer, as if they are dried or burned up. It is often followed by the leaves curling and shrivelling. Deciduous tree leaves will wilt and if corrective steps are not immediately taken, may eventually turn brown and drop. 1. If your Japanese Maple has leaf scorch, but the tree is still alive, there's most likely nothing to be too worried about. 2. It is identified by its leaf color – a deep red that shows up in the fall, making it really attractive as a decorative tree in this season. This wilt is caused by a fungus in the soil. Roud mites only eat maple leaves that are still developing. All Rights Reserved. Outer leaves mainly show burn while those underneath are fine. Over-exposure to sun can result in brown leaves, a phenomenon also known as "leaf scorch." Leaves that are spotty and are turning brown along the veins … Tiny clumps of sawdust indicate borers. I recently planted a 6 - 7 foot Japanese Bloodgood maple which I purchased from Gaspers Nursery. Carefully dig the tree out with a shovel.