"Richard Burge" wrote
If i didn't know better i'd say sooty mould from aphid "droppings" but
it's thr wrong time of year. These plants (4 to 5 feet) have been outside
all year and have sooty black deposits on the leaves. These deposits rub
off with a finger or thumb.

These Ilex Aquifolium are variagated, in pots and we're stumped...

any ideas for what it is and a control?


Scale Insect.

--
Regards
Bob H
17mls W. of London.UK