Thanks for all the comments. I see you all agree on letting it alone, and thus I will do as you suggested and monitor any developments.

If I can ask one more question, would you go for some antifungal treatment or just wait? It's my fist vanda and as you can imagine I am worried :-)

best,
Luigi

I haven't seen fungal diseases that look like that. I still think it somehow was too hot or got too much sun.

The sun in these weeks is not hot and the side of the plant facing the window is the other. Previously it was in a shop of a mall, so I would exclude direct sun. Also in the shop there was no direct light close it (such as a led lamp or similar).

I have notice that people suggested not to water the plant every day in winter. I was watering it every day in the last three weeks with warm water. You mentioned that the leaves have small linear wrinkles and that my plant looks dehydrated. Now I am confused :-)

Do you agree that in winter (20 degrees C inside, 5 outside), on foggy days, I should not water everyday and wait 2/3 days before one shower and the next (in the shower in winter I only wet the roots)

Maybe the leaf suffered because of some issues related to watering or to the change of environment (consider that there must have been some suffering, since the plant lost a spike when I bought it -- I moved it from a vase to a hanger)

Thanks estación seca, I am learning a lot.

PS: I checked a little bit below the leaf and the stem looks green. This looks a good news to me.


Luigi

I water mine every day.

Dear all,
some updates. The situation of the leaf has deteriorated over time (see picture). This was expected since you told me I would have been probably lost the leaf. I didn't touch it until now, following your suggestion.

However today I decided to remove the dried part and below it I saw the issue has extended also to the other leaf underneath (see other image). I took a picture of what is below at a distance of 12 hours and I see a small enlargement of the issue. My worries is that this is going to be propagated to the entire plant sooner or later.

I know you suggested me not to interfere and leave the plant to lose the leaf, and I did. However I didn't expect other leaves to be contaminated by the same issue.

In the light of this, what is your opinion now? Should I remove the sections of the leaf which has been contaminated or leave as it is?

Thanks to everybody for your help

Luigi

PS: in the second picture, left side is 12 hours before the right side

Luigi ...... ventilation and air-movement can help cut down on unwanted organisms activity.

Satisfactory lighting levels and temperature range will allow this nice orchid to grow properly.

When in a container, and if humid for a long time in the container, then some unwanted activity could occur.

In your case, a safe dose of the alliette or even a copper spray onto the stem and leaves, is not expected to hurt the plant.

The focus will then be to ensure satisfactory growing conditions ----- that could include considerations about gentle air-movement around the stem and around all the leaves.

Luigi ----- also, sometimes losing 1 leaf can be normal. Sometimes, a newly developing aerial root may just cut things off for an existing leaf ...... cuts off supplies at the base. And the whole leaf can fall off.

This might not be the case for you. But it's not always bad when a leaf falls off a vanda.

I don't know what is causing that. I would still leave it alone.

I agree with ES. If the side of the leaf is not rotting or mushy or wet etc ....... just allow it to remain dry, and leave as-is.

Thanks everybody for the comments. I will keep on following your suggestion and monitor the situation. In case I will perceive the problem is spreading to a contiguous leaf I will think about taking some actions.

For the moment 2 overlapping leaves have been involved. The black spots where one over the other. The issues has been spreading (or originated) between layers of leaves and I am monitoring if in the same positions the third layer is going to be affected or not.

Thanks SouthPark for the specific comments.

I already took actions to increase the air ventilation by ordering a small fan to be turned on every hour for about 15 minutes, it will arrive beginning of next week. Also the light is not sufficient in my opinion (we have many cloudy days in this period): a led to integrate natural light is on its way.

I will keel you updated.

best,
Luigi