Although a fungus causes root rot, the treatment is not a
systemic fungicide. You must treat the conditions which permitted
the fungus in the first place. That means completely repotting
with fresh soil. (No old soil left to contaminate the new soil.)
And that's no guarantee you can save the tree. Usually, by the
time you discover root rot, it's too late.
Repot in to a well draining, soil-less mix into a clean
(sterile) pot. And quarantine the tree from your other bonsai,
because some root rot pathogens are spread by water splash, while
others are spread by fungus gnats or shore flies.
By the way, your soil is obviously not coarse enough to
drain adequately or else you would not have gotten root rot in
the first place. Root rot begins when the plant roots are
deprived of oxygen and/or attacked by a pathogenic fungus.
Saturated soil weakens the plant so it cannot adequately resist
fungus attacks. That means you must start using a coarser, faster
draining soil for the rest of your bonsai as well, if you want to
avoid a similar fate for them.
Alan Walker
http://bonsai-bci.com http://LCBSBonsai.org


-----Original Message-----
From: Don Walker

Does anyone have any suggestions for a systemic fungicide for use
on a
Texas Ebony (Pithecellobium flexicaule) with root rot?
Thanks,
Don

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