Since my last post, MANY LARGE black flies are swarming on this
gardenia by our kitchen door. It is a large plant which has had black
fungus and white disks on leaves before. Leaves are very green, recently
fed plant so need a fix that is not going to provide too much nitrogen I
think.

I can only guess that their is another attack occuring but do not see
the black fungus. The sweet deposit from the attackers must be
attracting the black flies.

What is the suggested treatment?

THank you, Dave