What is happening with these grape leaves? This is a 5-year old seedling grape growing in a container. The new leaves of the last few weeks look like this, but earlier ones are normal. I fertilized the pot with nitrogen recently, but otherwise I just water it regularly. I found a couple of (maybe) cast aphid skins, but otherwise no pests I can find on new or older leaves. Photos show the very bumpy and distorted growth. Anther photo with backlighting shows the leaf transparency.