When I had this it was woolly aphids. Any sign of them in white 'wool'? If
so crush them between your fingers

John Martin wrote:
: We have a (previously neglected) Camellia in the garden, which a
: black/grey soot-like residue on some of the leaves and a few buds. Is
: it likely to be a fungus? Treatment?
:
: It's possible that the plant could have been splashed while cleaning
: out gutters but the 'soot' doesn't wash off easily
:
: thanks in advance
:
: John