Q.Disease of black spot on a red tip
Not a gardener but have noticed all the leaves are about gone on red tip plant , is it too late to save them now with spraying and removing died leaves from ground . Just been reading and didn’t know that it may be to late too save the three red tip plants .
If the entire shrub has lost all it's leaves to Entomosporium leaf spots, you will not likely be able to save the plant.
If you have other shrubs, this article will help you with a treatment plan.
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/photinia-leaf-spot.htm