Areas of damage on citrus tree trunks
I got two little Page Mandarins and didn't notice when I picked them up that the bark is damaged on both. New bark is growing into the bare space. The damage goes from the root stock to the tree itself in one long strip on the one and the other one is the same except not so long a strip and there's another little spot on its tree trunk. I'd post a photo, but don't know how and my husband is away on his work hitch. I was wondering if there is anything I should do clean off the dark mildew that is on the tree trunk and that has discolored the wood inside. It looks like black mildew.
I'm not losing any money on them and they have lots of leaves, but most of the new growth is full of leaf miners and they look awful, but are still green. They're not losing any more leaves than is normal, from what I can tell. I wish I had found them sooner in the season so I could give them some Foliage Pro to help them.
The bark that is filling in seems to be healthy-looking.