Rust on leaves of newly planted citrus

A month ago we planted a grapefruit but it has three or four leaves looking really sick now. It seems to be a rust and when I googled it, it seems as though it is citrus rust mite. I have sprinkled neem grains round the base and some magnesium sulphate over a heavy layer of mulch. One of the things I worry about is that the soil doesn't drain very well. Is it a case of moving it? Should I take away the mulch and put the neem granules under it? Advice please!

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