I have a pink hydrangea which has white oblong markings on the underside of its leaves, a bit like polystyrene. I assume it's some kind of fungus! Does anyone know what it is and how I should treat the shrub to get rid of it? Thanks.
Depends on how heavily infested it is - if it's bad then it would probably be worth scrapping the plant unfortunately. If it's not too bad you could try a chemical treatment, but I have no personal experience with it so can't make any recommendations for specific products.
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