In article ,
says...

I have a lemon tree in my garden in South Africa. The leaves have what
looks like a black fungus and also white sticky "cotton" looking
nasties. All this is under the leaves. Can anyone help and tell me
what to do please?





Sounds like a mealy bug infestation, if the tree is small enough you can
brush them off using an old tooth brush, but as your climate is a lot
warmer you should be able to use one of the biological controls, you will
have to look locally for information as some of the insects which are
safe for us to use because they die in winter might not where you are.
the most common predator of mealy bug in use is a small brown australian
ladybird.
Are none of your local birds interested?
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea