Photinia

Question

One of our red robin photinias has suddenly died. We did not notice any leaf spot, and others near to it appear to be ok.

Answer 1

A fungus is the most common plant disease effecting the photinia.
Clean up any leaf remains from the ground and dispose of.
Inspect the plants and you may want to treat with a fungicide.
Here is a link to review care requirements.

https://www.gardeningknowhow.com/ornamental/shrubs/photinia/growing-red-tip-photinia.htm