Hello, I have several quercus dentata that are showing yellow spotting on their leaves. The damage is slow to kill of the leaf (if at all). I do not think that this is insect damage as I have not seen anything around or on the leaves that would have made this damage, however the coloring does follow through the back of the affected leaves. I have been vigilant about picking up all fallen leaves as to not spread anything to the soil. Any advice or help would be greatly appreciated.