One trident in clump leaves turning

[Jrmcmich]

Wondering if nutrient deficiency or something to cause 1 of 3 trees in clump to be turning fall colors super early? Had noticed what I assumed Might be chlorosis with lighter green and now this. Was reading possible adding iron but not sure. They were repotted in spring into soil (80/20 perlite/coco coir). Use chop stick method to determine water needs. Use collected rain water for all my trees.

 

[leatherback]

Wondering if nutrient deficiency or something to cause 1 of 3 trees in clump to be turning fall colors super early?

unlikely to be nutrients, or at least, availability of nutrients in your substrate, considering you have 3 plants in the pot, and only one is showing this behaviour.
I would search in the area of root trouble. Maybe the side this one is growing on is mostly in the sun, and the roots of this one got more overheated than the rest?

You seem to have pretty nasty fungal infection on all trees to be honest.

 

[Shibui]

Agree that nutrient deficiency is unlikely as all 3 trees have access to the same nutrients in the same pot. If nutrient deficiency, all 3 would be showing similar. Same with root rot and dehydration - all 3 have access to the same soil and water so unlikely to see one showing root rot or dehydration when others are OK.
More likely, something is preventing that individual from taking up available nutrients.
How has this clump been formed? Often the trunks are tied together just below soil level. We occasionally see the tie cut circulation to one trunk before the others leading to localised sap flow restriction. Check below soil level to see any possible restrictions.
Far less likely, genetic variation may make that tree more susceptible to any of the factors above or some other pest or disease that the others are less susceptible to.

 

[Jrmcmich]

Agree that nutrient deficiency is unlikely as all 3 trees have access to the same nutrients in the same pot. If nutrient deficiency, all 3 would be showing similar. Same with root rot and dehydration - all 3 have access to the same soil and water so unlikely to see one showing root rot or dehydration when others are OK.
More likely, something is preventing that individual from taking up available nutrients.
How has this clump been formed? Often the trunks are tied together just below soil level. We occasionally see the tie cut circulation to one trunk before the others leading to localised sap flow restriction. Check below soil level to see any possible restrictions.
Far less likely, genetic variation may make that tree more susceptible to any of the factors above or some other pest or disease that the others are less susceptible to.

Trying to recall if I used A wire to join under soil. I will See if I can poke around under soil to jar my memory

So I poked around and see I did use a wire. Might be hard to see but a small wire wrapped and tree to left is the one with leaf discoloration

 

[Shibui]

So I poked around and see I did use a wire. Might be hard to see but a small wire wrapped and tree to left is the one with leaf discoloration

This is likely to be the cause. Need to check further to see what damage the wire has done to the trunk, whether it is cutting off circulation from roots to trunk. If that's the case it's likely too late to save that tree. Maybe the wire has just cut circulation to one trunk so far but the others will be affected as they thicken too.
Sometimes the trunks can produce new roots above the wire to save themselves. We usually bury the tie deep enough so that the clump will grow enough new roots to produce a new root system above the tie.

 

[Jrmcmich]

This is likely to be the cause. Need to check further to see what damage the wire has done to the trunk, whether it is cutting off circulation from roots to trunk. If that's the case it's likely too late to save that tree. Maybe the wire has just cut circulation to one trunk so far but the others will be affected as they thicken too.
Sometimes the trunks can produce new roots above the wire to save themselves. We usually bury the tie deep enough so that the clump will grow enough new roots to produce a new root system above the tie.

So I could Snip wire but like you said might be too late. Guess worth a try