Necrotic spots rapidly spreading through out this vanda tessellata

[Russell 99]

Necrotic black spots rapidly spreading throughout this vanda tessellata plant. Is this a symptom of a virus or bacterial infection. Any solution to save this plant as its one of my first orchids

[estación seca]

This looks like Phyllosticta.
Phyllosticta Leaf Spot

[WaterWitchin]

Sure looks like it to me, as well. You can try to treat it, but it looks pretty far along so doesn't show a lot of hope. Make sure it's away from other orchids and watch the others closely.

[estación seca]

More information. It looks like you need to throw this away because you won't be able to eliminate the fungus from this plant.
Phyllosticta capitalensis

[Russell 99]

Thanks!

[Roberta]

Did it get cold? If that's the case, you could watch and see if new leaves are OK in a warmer place (and perhaps the black spots will dry up), but do isolate it from other plants.

[Russell 99]

Originally Posted by Roberta

Did it get cold? If that's the case, you could watch and see if new leaves are OK in a warmer place (and perhaps the black spots will dry up), but do isolate it from other plants.

Yes it did get quite cold since I moved to the mountainous area(1300masl) of Sri Lanka
Temperature dropped from 28-30 to 23-18-15 Celsius.