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Dead spear leaf on Mule Palm

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I have a large Mule that has been in the ground in its current location since 2016 (see https://www.palmtalk.org/forum/index.php?/topic/48668-moving-a-mule/). 

It has been growing very quickly and robustly since then, with no indications of any problems that I have seen.  Yesterday I noticed that the newest leaf spear emerging is completely dead and dry (see picture).  The next-oldest leaf to its right appears OK as far as I can tell, though it has not fully emerged yet.

This is obviously not from cold damage, given that it is now October and we did not even have a real freeze last winter.  Our early summer was slightly rainier than usual, but nothing extreme.

I'm a little depressed about this, since it has been doing so well for the past 4 years.  I previously had a large Pindo in the same spot for almost 20 years. That one died after initially showing a similar symptom - the newest leaves all emerged dead.  Eventually the whole palm died from the youngest to the oldest leaves, and the trunk decayed into a foul-smelling wet mess. 

I'm completely stumped about what might have caused this, and whether there is anything I could or should do to save the palm at this point.

Any suggestions would be much appreciated.


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I would pour H2O2 (Hydrogen Peroxide) down the crown shaft once a week for a month as a start.


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The photo in your other thread didn't show any signs of Fusarium, but it could be a different fungus.  From the symptoms it sounds like it might be "bud rot," generally caused by either Thielaviopsis or Phytophthora.  Here's a big article on it.  I use Banrot 40WP on my palms if I suspect a fungal disease.  If you've spotted it early enough a drench of Hydrogen Peroxide and a systemic like Banrot should help.  These fungi can also live in the soil for a long time, which may be why this one caught what appears to be the same disease that killed the earlier Pindo. https://edis.ifas.ufl.edu/pp144


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