QuestionsHow to growTrees and ShrubsPests and DiseasesOak tree 0 Vote Up Vote Down Kathleen Dunne asked 16 years ago Can you advise how I might treat a young oak tree that has a shiny gloss on the leaves – it looks like it has some type of disease. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago A shiny gloss on leaves is probably due to deposits from greenflies on the leaves and young shoots. This is not a significnat problem.