Affected leaves eventually fall off and in bad cases the plant can severely affected. The latest research indicates that in most cases the damage is caused by damp, humid and / or cold conditions rather than disease.
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Besides, why are the leaves falling off my Photinia?
Photinia are susceptible to one such specific fungus. If you don’t notice the spots and don’t treat the plant with fungicides when the fungus is still active, then the leaves turn black and fall off–one branch at a time. The attachment also shows what the leaves look like as the fungus takes hold.
Secondly, do Photinias lose their leaves? Entomosporium leaf spot is a common problem for photinia, and it’s recognizable by small red spots on both sides of the leaves. Older plants might have larger, dark red, brown or gray spots with rings around the edges. As the disease progresses, the leaves fall off, and the plant can eventually die.
Considering this, what’s eating my Red Robin leaves?
If Sally you can see jagged teeth marks where pieces of the leaves have been eaten it could well be that the Photinia leaves are being eaten by a Weevil and the most likely Weevil could well be the adult Black Vine Weevil which are nocturnal and are only active during the evening.
Can I prune red robin in October?
As with most evergreen shrubs, the best time to Prune Photinia Red Robin is at the start of the growing season – late March/early April in UK. It will soon re-grow, and then can be kept under control by pruning as and when required – above.