I believe the color flush is a natural temporary sunscreen till leaves make chlorophyll.

I made concrete posts.   They work very well. The roots adhere to the concrete very well. No burlap needed.   I tried to make my posts not have something on top but realized that they needed something on top for support as the plants cascaded down. So I put a long piece of rebar inside the concrete as I made it and had that rebar protrude up through the top middle of the concrete which gave me an attachment point for  A pressure-treated wooden post which I drove rebar through and put hog wire on the rebar.
Brad

When casting concrete, you can provide a hole in the concrete for inserting rebars by embedding pieces of pvc pipe with an inner diameter large enough to later pass the rebar through. Before putting the pipes into the wet concrete, just run some tape over the ends to exclude concrete.

I'm training six young Soursops in ground using small logs as weights and twine to tie it off. I have gotten the first scaffold branches to behave. Those trees tend naturally towards upright growth making the fruit hard to harvest or hand pollinate. It is working so far, along with some selective pruning of upright growing shoots. The video maker is a friend, I asked for the update.

https://www.youtube.com/watch?v=r5KeGccP9Jk

Carlos from Miami recommended these rotor sprays, I put them on 18" risers one on each side of trees. It is very easy to see if they clog, usually it is ants or spiders coming in from outside, the orifices are large enough to not clog. With low pressure they still cover 4 ft. diameter, with max pressure they cover +10 ft diameter. I interplant smaller plants heavily around trees and this pattern covers the entire root zone. I feel that keeping the entire root zone moist helps maintain soil life and encourage roots across a larger area than drip or microsprays.
https://www.youtube.com/watch?v=Jtn1_wfgqA4

This is the specific rotor I am using, but the variable valve is probably not necessary, I usually just adjust pressure to change spray diameter. These screw into an 18" riser which plugs into tubing. I support the riser using a 2 ft length of 1/8" heavy galvanized fence wire and tyrap.

I am using a home made version of fish hydrolysate produced by first culturing a liquid EM and using that to ferment saltwater fish waste with added sugar. The result contains both the bacteria, sea minerals from fish and the usual NPK found in fish hydrolysate, approx 3-2-1. It took about 3-4 months using 200 lbs sugar, whey from 5 gallons milk, an EM starter culture, and 200 lbs fish guts/heads/etc from the local market (traded for mangoes).
Smell is fishy but sweet/sour, not the smell of rotten fish you might expect, there is some fish oil.
Yield was 40 gallons strained emulsion plus 20 gallons leftover bones and scales.
Cost was low and has been working well as soil drench and foliar, one cup with 5 gallons water.
I am considering adding ground papaya as a pre-digestion stage in my next batch.

At 17.5 x 20 you would have years of plenty of room between trees. Space like that could be used for intercrops of shorter term plants or trees like banana, papaya, guava, etc. Some even try planting close and removing every other mango tree but others I've seen try that became attached and couldn't bear to cut out 1/2 their trees. There is a lot of work involved in preparing land, setting up irrigation and all to put in small trees so widely spaced, it seems like using that space for something beneficial would make sense.

Yes, I made 10 of these posts and so here is a side-by-side of 24 hours growth.

I am leaning toward removing the tree and plant a new one (likely raised bed/pot approach and maybe also amend the soil below it too).

If you remove it be sure to check root area for problems, lots of trees get potbound circling roots, etc.

What chemical do the posts have on the label? If CCA the plant roots will be in contact with Chromium, copper and arsenic.
Marine piling tags may have a figure of 2.5 lbs of this chemical per cubic foot.
http://www.woodpreservers.com/marine-construction-piling-lumber.php

Surprised to see my mamey flowering too. Less than 1 year in ground grafted Pantin.

I never stopped fertilizing my one year old trees and most of them are flushing. SW Florida, zone 10a/b

There are many many Thai fruit videos, almost anything and everyone has a cell phone but no one can show a white Jackfruit being opened. Maybe there is a reason why? If you really had such a thing, wouldn't you advertise by video?