dwarf kaffir lime tree growing black leaves

It is spring in Sydney, Australia and I have a dwarf Kaffir lime tree in a pot and it is growing new leaves that are completely black. The remaining tree has perfect glossy leaves. What on earth could this be? I gave the tree a sprinkling of chicken manure pellets and feed it a seaweed solution every once in a while. It was potted with a mixture of citrus potting mix and certified organic potting mix for vegetables. Any suggestions appreciated.

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1 Comment To "dwarf kaffir lime tree growing black leaves"

#1 Comment By Downtoearthdigs On 09/23/2015 @ 1:17 pm

This is Sooty Mold.

Here is a link that will help you.
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm ^[1]

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