Leaf Spot on Standard Photinia

Greenish Fingered Girl

Good Evening Everyone, I am hoping you can help please! We have a standard photinia that we love dearly which has developed black spots all over each of its leaves. It is usually a very healthy tree and don’t know why this leaf spot has occurred! Does anyone have any tips on how to cure it please? 

Thanks

yorkshirerose

Photinia, if under stress are very prone to leaf spot, as are semi mature specimens.
Pick off the worst affected ( I know that may mean most of them at this time of year) or wait until they drop as new foliage appears , but make sure you collect and destroy all fallen leaves to avoid contamination

The attched link has some good information under the section headed 'problems'
Hope this helps.
https://www.rhs.org.uk/advice/profile?pid=145