Victoria,
Australia 
Hi, my mexican orange blossom's leaves have a black dirty substance on them and i've noticed it's on some of the stems too. Does anyone know what this is?
On plant
Choisya
3 Oct, 2010
Answers
Often, once the sugar is gone, the fungus leaves by itself. I would wash the leaves with plain water once the aphids are dead, for a start.
5 Oct, 2010
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Sooty mould. This grows on the sap which leaks from the plant when it is attacked by aphids (greenfly). Deal with the aphids then use a fungicide to kill off the mould.
3 Oct, 2010