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Hello!
So basically I have two Zelkova bonsai and both suffer from yellowing and droopy leaves that eventually fall off.
I mention that my watering practice is decent enough as I studied horticulture and am quite familiar with plants.
Also, I fertilize them every 2 weeks or so in the spring/summer period with a liquid fertilizer that has an NPK ratio of 3:6:6 (as I understand it might not be the best due to the low ratio of nitrogen but that's another discussion anyway)
I think the problem might be some aphids but what can be observed in the picture are just some potential eggs, I could not find any adult as much as I tried, so I am a bit confused. Otherwise it might be some species of spider mite (Tetranychus) but in this case there is no web present.

Thanks!

It is because it is indoors. Bring it out and it will recover.

That's interesting, I will definitely try it. Thank you!

Edit: problem is, many of the leaves have really minuscule punctures which can be seen if you hold the leaf and look through it at a source of light, which makes me think it could also be the case of a pest.

Edit 2: I found the culprit, it's hardly noticeable in the photos since they are really tiny, but I've observed a red spider mite (Tetranychus urticae) moving about the underside of one of the leaves, so I'm now looking for an insecticide such as Nissorun, for example.

kept inside too dry hence red spider mite. Higher humidity and they will not be there.

Thank you kindly! Do you reckon misting is something beneficial for the future?

It can help a little to mist with liquid soap and water. But indoors it will still deteriorate over time. Bring it outdoors and all your problems will be gone in a few weeks without anything else than watering the tree.

I'm not an expert but you need to repot the tree, wash the roots and put it in akadama,

Get the tree outside. Over the course of 2 weeks move it from dapples sun to real sun. Put it in a well-ventilated spot and the problem will sort itself out. Then do not bring it inside again. Did you say you have a background with plants??

Note, insecticide will not do anything. Spider mites are not insects.

First off, I agree that this is all happening because the tree is inside.

leatherback wrote:

Note, insecticide will not do anything.

Sorry LB, but that's not true, ANY pyrethroid will kill them almost instantly, and household concentrations are harmless to humans.
If you want to use it or not, that's up to you, but it does work...
I just wouldn't bother to buy it just for this case...