Oncidium ornithorhynchum - leaf tips: bacteria or rot or blight?

[An_DS]

This Oncidium has been in my collection for a long time (one of my first plants, 10 years ago). Last year I divided the plant. Since at least one year (but more is possible), tips from new leaves go bleak, as you can see in the pictures below.
First it doesn't look like drying of the tip, it turns light brown and looks a bit like a wet tip. Because of this, I think it could be bacterial or a rot. However, it doesn't smell or becomes soft tissue.

[WhiteRabbit]

[tarev]

Maybe leaf edema..roots takes up more water than the leaf can transpire.

[camille1585]

Leaf edema usually appears are raised lumps on the leaves, so I don't think it's that. My guess would be bacterial as well.

[Ray]

I would speculate Erwinia, which is likely to be in the entire growing environment, not just that plant.

I would get some Physan and spray every plant and the area they are in.

[euplusia]

Whether fungus or bacterium, take a sharp razor blade and cut away the sick tips 1 cm away from infection in healthy tissue as first aid.
Often an infection follows imbalanced nutrition and a lack of light and moving air. Im many cases roots are poor.
Here the leaf tissue looks pale. So I think of a symptom of deficiency. A weakly weekly fertilizing schedule is helpful. The first malnutrition is a lack of calcium, which appears after months to years in cultivated plants.

[An_DS]

Thanks for the advice.
The strange thing is that the plants don't die, after looking water soaked, the leaf starts to dry. I think, in case of a baterial infection, things would spread very fast and cause death. I cut off the leave parts yesterday.
Physan, however is not available in Belgium (or even Europe), I will look at some fertilizer. Would a 3% peroxide spray treatment be of any help?