Why are my vanda leaves mottled
 

Hi,
I am new to posting on this forum. I have developed a passion for orchids and last year I bought a healthy vanda in bloom.It's progressing well and has rebloomed, but the leaves have developed a mottling. Is this some sort of deficiency. I water the vanda by soaking the leaves in a bucket. I add tomatorite fertiliser and cal mag to the rain water I use.
It is watered at the same time as another vanda I have which has not developed this mottling.
Can anyone help?

Welcome to the Orchid Board.

Do you mean you soak the leaves, or the roots? For how long?

What are your ambient temperatures and humidity?

Sorry I meant the roots, not the leaves.

---------- Post added at 07:54 PM ---------- Previous post was at 07:53 PM ----------

Ambient temp about 20 degrees centigrade. Humidity about 60%

---------- Post added at 07:56 PM ---------- Previous post was at 07:54 PM ----------

roots soaked for about 1 hr/day

Those temperatures are somewhat cool for many Vandas but not impossible.

I don't know what is causing the leaf problems. It looks the way some virus infections look on other genera, but I can't find any photos of virused Vandas that look like that. It could also be fungal.

I might suggest calling a nearby university with a botany department, or a local government agriculture office. They may be able to look at it under a microscope.

I wouldn't treat blindly - I would find out what it is.

I would not use the soaking water on any other plants, nor would I soak the Vandas together.

Thankyou, I think you are right, trouble is I don't want to throw it as it is still growing and blooms.