Mule palm early diagnosis

[palmluver]

Over the past year, I replaced a row of declining queen palms with these mule palms.  They are putting out new fronds, but I'm noticing that some of the fronds are developing grainy light colored spots.  At times depending on how the sunlight is shining some seem to take on an orange tinge.  Does this seem like a nutritional deficiency or more like some type of fungus? They are getting what I thought was a sufficient application of granular palm fertilizer and even some additional manganese.

[palmluver]

I may have answered my own question.  Found this article discussing potassium deficiency in palms.  It starts with orange tinged spots and progresses to browning at the tips toward the center, which I am also seeing.  I'm going to try some Langbeinite 0-0-22 and hopefully that will stop the progression.

[Robbertico18]

have the mules settled in now with the added potassium ?

[palmluver]

I ended up doing a lot more than just adding Langbeinite.  If you're interested in the other steps I took you can find them in my other posts by clicking on my avatar.  Some of the posts refer to queen palms, but I'm actually treating both the queens and the mules the same.  Most of the palms seemed to be improving by the end of the summer, but will have to see how they do this spring when the new fronds come out.  During the course of last summer, I learned that there are multiple reasons that could cause a palm to be unable to uptake potassium (as well as other nutrients) from the soil the most critical of which are too frequent watering and high soil pH.  There is also a mutation that can be present in mule palms that can manifest as potassium deficiency for which there is no cure.  I am hopeful that it's not the cause of any of the issues with my palms, but I do have 1 that is still lagging behind the others.