I have a poorly orange tree, the leaves/ stems look like they are spotted in soot, and the oranges have been the same small size since last year. Have fed it, not over watered and sprayed the leaves/ stem in case it is insects. Kept it in over winter and basically done all the things I think I should have done. Please help
Cheers Trickie
I googled "soot on orange tree"... http://www.fruitexpert.co.uk/OrangeTrees.html
It is very likely scale insect, have a look on the back of the leaf, and the stems, you might see some little brown patches which look very much like small scabs. I usually wipe mine off with warm water with a very little drop of surgical spirits dipped in cotton wool, you might need to do this a time a two before you will totally get rid off it, but it all comes back looking good.
Jeanne
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