Pyracantha leaf problem
Can anyone help please? Established pyracantha growing up wall. Leaves nearly all have a 'silver' look in the centre, extending the length of the leaf. On closer inspection the top layer of the leaf has separated from the rest of the leaf but remains attached at the edges, so this 'silvering' is the top layer sitting apart from the rest. Any ideas why this has happened and if we need to do anything about it? If so, what?