Hello, I have a 2 year old Winecrisp apple tree that I bought because it was advertised as immune to apple scab that I have had with some of my other apple trees. Although I have not seen any scab on the leaves it seems to have rust and leaf spots (see photo). I have read that I shouldn't use chemical fungicides on it but want to get the rust/spots under control. I use Immunox on my other apple trees for scab with success and wanted to know if I can use it also on the Winecrisp. I also have a Reliance grape vine that was advertised as resistant to Antracnose but seems to have black rot. Can I use the Immunox on it? Thank You, Ken