young JBP yellow and discolouring needles

[zizz]

Hi everyone, I live in the UK and started caring for my first JBP since last September, so I'm definetly really new to bonsai keeping.

Everything went great, until few weeks ago, my JBP started to look abnormal, please see attached pictures.

The needles are getting yellow, discoloured and brittle, I first thought it's because of the strong sun, so I started to move the tree inside when the sun was really strong after lunch time. However I realised that it might actually be lack of nutrients because I haven't used any fertilisers on it yet, could anyone give me some advice on how to save it? I don't want to start using fertilisers when the tree is sick, so I'm really struggling to think of what to do.

I often water the tree with Britta filtered water every 2 days or so depends on the weather and temperature, with 3 passes of water to make sure it has been watered thoroughly, the soil has great drainage ability, so I don't think there will be any root problems.

If it's a sign of lack of nutrients, should I start to use fertilisers? At the moment I do have a liquid one called Formulex that I use for all my indoor plants, NPK is 2:0.9:3.3, should I use this or should I buy solid slow release fertilisers, and any recommendations for the brand that I can buy in the UK?

If the sun is not the cause, should I stop bringing it inside when the sun is strong?

thank you for reading such a long post, I really don't want the tree to suffer, any tips will be appreciated.

 

[rockm]

Pines should NEVER be brought inside. Bringing them stresses them even more. As they try to adjust. Constantly bringing in and out quadruples the stress as with each move the tree tries to compensate. Plants are rooted to the ground mostly They dont like moving around

A black line also should be kept in full sun. It is doubtful the trees problems are due to English sun. This species is kept in full sun in the U.S. Southwest which has extremely intense sun

Also NEVER fertilize an ailing tree. It can complicate things

I hate to be the bearer of bad news but this tree is dead. Evergreens tend to not turn this color until they have expired or are mostly beyond help. Pines don’t come back from completely brown foliage. Unless there are a couple of green new shoots emerging this tree has passed on

The issue here is likely a soil issue. Likely too much water. A pic of the soil would help determine what was up

 

[gschup]

If pine needles look like this, the tree has probably been dead for quite a while. Think about how long a chopped Christmas tree can remain green.

 

[Shibui]

Agree with the others. Pine foliage is slow to show problems. By the time you see brown needles it's likely the branch/tree has been dead for some weeks and we have forgotten the event that caused it.
Brown needles like this is usually dehydration but that can be from direct dehydration - the roots did not have enough water in the soil - or from root rot, usually caused by chronic overwatering over many weeks or months. Root rot means the tree cannot take up water, even though the soil is wet, which means dehydration and almost identical symptoms to dry soil. You can only tell the case by analysing past care or checking the soil moisture content.

 

[zizz]

Thank you all for replying. I have to admit it broke my heart when I found out it's dead, blamed myself not to spot something wrong earlier and shouldn't have followed some random suggestions I found online (bringing the tree inside to avoid strong sun), oh well, in the meantime I will still leave it out in the garden to see if miracle can happen...