Ik zet mijn bonsai in de zomer altijd buiten
Nu hen ik ondekt dat er mieren in de bonsai pot zitten
Zou ik de bonsai niet better verpotten ?
Ben bang dat er in de gangen die de mieren maken water blijft staan en er wortelrot zou onstaan !
Hij ziet er volgens mij nog steeds gezond uit

Ik denk niet dat in de gangen water blijft staan. Als je drainage goed is tenminste.
Waar mieren een enorme hekel aan hebben is veel water. De pot een half uurtje onder water zetten moet genoeg zijn.

Sorry voor de Engelse tekst hieronder maar dit was even een snelle oplossing voor mij.

ANTS
Ants on your bonsai can be used as an indication that you most likely also have aphids. This is because ants often carry the eggs of aphids to suitable vegetative growth in order to eventually farm the sugary secretion they produce called "Honeydew." The ants themselves are generally not a problem but if you see them in large numbers around your tree they may have built a nest in the pot, in which case they should be dealt with.



SYMPTOMS
As mentioned already, ants themselves are generally not a problem but they often carry aphid eggs and fungus such as the "black sooty mould." They sometimes will also build nests in your bonsai pots and in the process of doing so will excavate a lot of your growing media.

TREATMENT
If you do find an ant nest it can be a sign that your trees are not being watered correctly, however in the case of some species such as pines which prefer drier growing conditions, this cannot be altered. Simply dipping the whole pot into a container of water will not permanently solve the problem either. You will need to use a pesticide such as Koinor as a soil drench, and which will prevent many other common pests. You may also use Kemprin or Bungy.

Link: www.bonsaitree.co.za/pages/problems-and-solutions

Je hebt alleen mieren in de pot, als er luizen zijn. Daar tegen spuiten dus..