Grafted Japanese white

Hallo everyone

This grafted Japanese white plant was imported from Japan to South Africa May 2019. A area on the tree the needles are very yellow at the base and the rest of tree looks fine…can this be from to much water?

How rest of tree foliage looks and its roots.

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Have you read this blog by Michael Hagedorn? Discussed how to tell overwatering from needle cast.
When you show the soil was the bottom or the sides overly moist or wet?
Overall the foliage looks ridiculously healthy!! The foliage is all grafted? Well done!!!
Be a Bonsai Sleuth: What is Needle Cast and What is Overwatering for Pines? | Michael Hagedorn :heart_eyes:

Thanks the soils bottom and sides were just moist…