Please do take more. preferably in the day. and in focus.
Here are the pictures that we need:
1- overall canopy shape 2- close up of twig and bud arrangement 3- any fruit flowers or leaves.
Yes, I agree doing it as an in addition to would be beneficial. Most often when i hear people doing phosphite treatments they mean basal bark sprays and injections. Those will have no effect on any foliar fungi.