Calling CIDP experts

[96720]

What is wrong with this CIDP is it water, fertilizer or a disease 

[Jim in Los Altos]

CIDP as well as most Phoenix species are highly susceptible to magnesium deficiency. I have to give mine lots of Epsom salts to prevent newer leaves from this symptom. 

[96720]

Thanks I’m not one for fertilizing but I will put epsom salt on this one a canary 20-30’ away looks great. How much epsom salt do you put on? Thanks again!!!

[Jim in Los Altos]

37 minutes ago, 96720 said:

Thanks I’m not one for fertilizing but I will put epsom salt on this one a canary 20-30’ away looks great. How much epsom salt do you put on? Thanks again!!!

Start with four cups spread on the ground under the canopy and water in. You can repeat that monthly for three months then apply about three times per year. The damaged and yellowed leaves will not improve but newer leaves will stay green and the palm’s canopy will eventually be all green.  

[96720]

Thanks!!!! I will try that 

[Darold Petty]

Are we sure that the deficiency is magnesium, rather than potassium ?

[Looking Glass]

Magnesium deficiency doesn't cause leaf tip necrosis, and the yellowing has a definitive border.  This palm may have Mg deficiency, but it’s hard to tell unless you zoom out more.  Do a pic from further back.   That necrosis in the older leaves is K deficiency if nutritional.  

See Figure 1,3, 4 below…..

Mg deficiency in Palms:   https://edis.ifas.ufl.edu/publication/ep266

That 1st pic looks like potassium deficiency.  If you put a good amount of palm-specific fertilizer on it 4x per year, it will treat both over time.  You’ll need a 4K:1Mg ratio.  

[96720]

This is very helpful I think it might have both mg and k deficiency I will take more pictures when I’m home during the day. Thank you all very much it has been bugging me for some time!!!! I might also have a tissue analysis.

[96720]

Here’s a picture from a little distance 

[sonoranfans]

Potassium starts at the leaflet tips and progresses inwards, that s obvious here.  Mg deficiency, possibly as well but it tends to general yellowing  through the leaf.  I see potassium deficiency, not sure about Mg.  In arizona clay, I suspect generalized nutrient deficiency.  Looks OK in the newer leaves, just feed with a palm fertilizer.  K deficiency without Mg deficiency generally occurs in high drainage sandy soil, not what I would expect to find in arizona.

[96720]

I am in the foothills no clay very rocky soil can leave a hose running and never puddles 

[Looking Glass]

I agree, it looks most like potassium problems if this is chronic, and not sudden and rapidly progressing.  You could try consistently feeding it heavily with a good palm fertilizer, and perhaps a shot of 4 parts potash with 1 part magnesium to jump start it.  That would correct it over a year or two.