Vanda Jairak Brown - sudden mid-stalk and up leaf death
 

I have had this Vanda since March 2019 after purchasing at a local orchid show. It was in bloom then. Did not rebloom in March 2020 but it probably was no fed enough the summer of 2019. So this summer it hung from a tree branch here in Nebraska. Got probably every other day watering and roots andwhole plant sprayed w/ miracle-Gro orchid spray OR Mir-Acid in a diffuser or Schultz Bloom booster. It began to spike in September.

Bringing it in in October, it went into a 'baby pool' with 'everyone' (read here 30 Phals, Catts andVandas) with a probiotic soak overnight. THen all were inspecited cleaned, etc. Esp the Vandas that had dirt and debris in the stalk/leaf juntion area. Dried everything well. The spike progresses and BOOM- big beautiful flowers about the first week of November.

Last week about mid-stalk - I notice a leaf that is fully yellowed. Touch it and it comes clean off! :_( . I'd never seen this before and have had Vandas for about 3 years. Then today we saw a bunch of leaves from the mid-stalk to the top yellow and dropped off. On inspection it appears to me that the there is a yellow color developing down through the stalk. It has moved up the spike and all the blossoms are shriveling.

I see no little plant nodes down low on the stalk. The roots look really pretty good. A few dry and shriveled but they were like that before the summer. I have anti-fungal that I can use, but would like to verify that that would be the correct thing to do.....or if I should take a different tactic,....or walk our to the dumpster.

All my Vandas live with their roots in baggies in the fall-winter-early spring. Once a week they soak in a pickle bucket. Other than that we spritz the roots every other day or so in the baggies. Have either done well or I've dodged a rookie bullet for 3 years!:hmm

Pictures attached

My first thought is it got too cold. What are your day/night temperatures?

Temperature shock/kill is always a reasonable thought.
All our orchids came indoors just before October 10th. So now they are at a steady 72 degrees with minimal day-night fluctuations. They are all in our living room until May! Prior to coming indoors, I do not think there were any nights that got below 50 degrees. Temps can go from 80s to 50s as a normal fluctuation day to night. I do not recall that any nights before the move got below mid-50s.

It looks like an infection to me. Sorry to say, likely fatal.

You might try a copper treatment and keep it hot and humid to encourage rooting above and below the damage.

That is what I feared. Certainly need to isolate it while I consider options. Thank you for reaching back.