Black Leaf Tips on Satsuma
I have a very young satsuma tree (about three feet high). It being spring, it's put out a vast number of new leaves. It was going well until recently when I noticed that a lot of the young leaves have pitch black tips. I tried searching for this, but nothing describes it.
I've also noticed quite a few tiny (grass-blade sized) leaves lying on the ground around the tree, as if something was breaking it off.
And then I'm also pretty sure it has aphids or something similar. I went to the nursery and they gave me some poison called Merit, but it says I can't eat the fruit for 7 months afterward, which seems a bit pointless.
So far, apart from that, the plant looks relatively healthy, should I worry and if so, what can I do?