Is this normal? Please identify possible disease.

[ipdown]

Hello all,
this is my peyote grafted on top of blue myrtle. In the last 5-6 weeks it grew substantionally, but recently developed some light brown colouring, as
the flesh was wounded there and then recovered. What could be this? Is it bad for the plant and do I need to take some measures?
Thank you. Pics below, mostly visible from the top:

peyote_top.jpg (120.34 KiB) Viewed 1100 times

peyote_side.jpg (75.63 KiB) Viewed 1100 times

[anttisepp]

Mites. Care with acaricide.

[ipdown]

Thank you! I will ask local horti stores, would you recommend any specific substance or brand?

[LawyerNinja]

Thank you! I will ask local horti stores, would you recommend any specific substance or brand?

Very lengthy pinned thread in this forum here that describes different treatments for different pests

https://cactiguide.com/forum/viewtopic.php?f=24&t=42129

[ipdown]

that thread is whole encyclopedy. thank you!

[ipdown]

I treated it with something that might not be known to all of you as it might be sold locally under that name, but it sort of helped, as there is new growth that is green, and I assume that means those mites are dead now:

p1.jpg (87.39 KiB) Viewed 974 times

This is the chemical I was adviced to use, sold here under brand name Nisoran 5EK, the active ingredient is Hexythiazox:

nisoran_5ek.jpg (52.05 KiB) Viewed 974 times

I wonder if I need to treat it again preventive, or to wait and see how it goes.. What are your advises? Thank you for your help and knowledge!