Q.Why are my photinia’s leaves having partial discoloration?
Certified GKH Gardening Expert: I believe this to be a fungus that is common to the Photinia.
Here is a link that will help you:
https://www.gardeningknowhow.com/ornamental/shrubs/photinia/photinia-leaf-spot.htm.
I would agree with that but if you notice it isn’t leaf spots, this is what makes me leary about it being a fungus. Any other ideas?
Downtoearthdigs
Answered on June 15, 2015
I'm still fairly certain your dealing with a fungus.
Here are a few more links.
http://www.collierarbor.com/probPhotiniaLeafSpot.php
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