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you could try spraying the leaves with a fungicide. you could also try to watering with a fungicide solution to try to kill any infection that may be within the root system. fungicides are usually readily available in any nursery or perhaps at a Home Depot nearby, although it may already be too late for your little tree. if root rot takes hold and you begin seeing symptoms in the foliage it is pretty severe. if you have a specialized bonsai nursery nearby, i would take the plant there for a better diagnosis and possible treatment. since this is just an online forum, we can't see the plant in person and therefore we can only guess as to what the actual problem maybe and suggest possible solutions to those specific problems. bonsai can be a difficult hobby. don't be discouraged if your tree dies; you can only learn from your experiences and this makes you a more proficient bonsai artist. good luck and if you get a chance post a picture of your plant. perhaps we can be of more help then. - wade