I have a sick Mop Top and I have no idea what the problem maybe. Can anyone
help me please.

This is the second Mop Top that I have planted in the same position and it
looks as if it going to die. The first tree that I planted in the same
position died. I have three others in different positions and they are all
doing well.

The tree is still green but it has not got any leaves on it. The other three
trees all have leaves.

Any ideas?