I have a sick lemon tree. It is 2 years old, it flowers and produces lemons which drop off almost as soon as they are formed. I have seen ants on the tree but no green fly. The leaves grow fine and green and then some crinkle and curl and have dry brownish patches on them. The older darker leaves look as though they are being eaten. I've treated the ants with soapy water but inevitably they come back. I've had contradictory advice in Greece - use a systemic poison ( i don't want to), don't cut back, do cut back.
I think there may be 2 problems
I'm not in Greece at the moment - I will be in about 3 weeks
Any advice would be welcome