I have a dwarf nectarine prunes Persica which has leaf curl.
The top of the tree has died. Is the tree diseased? Should I pull it out? If I pull it out can I plant a lemon there or will the lemon suffer the same fate?
Yes, leaf curl is a fungal disease which can be treated with a copper fungicide such as:
It must be applied at budswell for nectarine so check your tree. If you prune the tree and see there's green wood, it's not dead.
You could replant a lemon tree there if it is in full sun, just dig through cow manure and Dynamic Lifter pellets through first, to improve the soil.
Answered: 16 Sep, 2020