Recently I have noticed that my basil is having a few problems. First I had a bit of a fungal gnat infestation. Not too bad, but I have also noticed that a few of the leaves are now getting a silver grey color on them. I tried to rub it off to see if it was mold but the actual leaf is turning this color. At the same time the top leaves are starting to look chewed. Though nothing appears to be chewing on them. I am not sure if this is related to the gnat problem as the gnats have almost disappeared, or if it is something entirely different. If anyone could help me out with this problem it would be much appreciated.