What is happening to my Skimmia?
I have recently noticed some leaf damage to my Skimmia Rubella and was wondering if it being eaten by a new insect, has caught a virus/fungus of some kind, or has just been affected by the changeable weather...
I have attached a photo of the damage - as you can see the damage is slightly different on different leaves. Some are yellowing (which from experience isn't that unusual for Skimmias), some have transparent patches (like tracing paper), and a couple have completely shrivelled up and turned red on the underside.
It is mainly the top / outer leaves that have been affected.
Just some background - the Skimmia has been in a large pot for about 4 years, and is in almost full shade (sees no direct sun). It has been very happy so far - and is fed with ericacious feed every couple of months. Is is also sited next to a Skimmia Magic Marlot which has no signs of damage at all.
Any advice would be greatly appreciated.