Posted: 30/03/2013 at 16:01
In my experience photinia can be fussy about situation. In my own garden I had to move it several times before it was happy.
Photinias do seem to have leaf issues.....a form of black spot, leaf drop ...as well as dieback.
They are often used as hedges but I think they don't like exposure to strong or salty winds, don't like soil too dry or too wet.
Dux2 is your " fine" photinia in a more sheltered position?
Those affected leaves will drop off. It could be the weather and the season. I usually prune back to healthy buds to promote bushyness and new red growth and this is what I would do.....in a couple of weeks when warmer