Sick Vanda ?thrips, scales, mites or other

[orchids44]

I have had this Vanda crownfox "sunshine" asconcentrum for 3 years. It was purchased from one of my favorite nurseries, R.F. Orchids. Every year it blooms prolifically.
Since I live in North Carolina, it is grown indoors in the winter under 4 T5 bulbs for 12 hrs/day. The humidity is between 35 - 45% in the winter with help of a humidifier.
I watered with rain water about every 4 days in the winter. It spends the summer outdoors where it receives morning sun.
About 3 months ago the roots stopped growing. Please take a look at the photos and let me known what you think, any input is appreciated. There is no longer any new growth of leaves.
I fertilize with MSU, once a week in the winter with 1/4 strength. Summertime I normally increase the frequency where every 5th watering is plain water.
I can't see anything with a 20X Bausch and Lomb loupe.
This is absolutely one of my favorites, gorgeous huge yellow long lasting flowers. Please help me save her. Thank you.

[orchids44]

thanks again!!

[WhiteRabbit]

* I merged your threads *

[Bud]

You have a hybrid that should flower twice a year. The humidity outdoors in your grow zone will sustain the plant even if you water it every other day.
You must have exposed it to damp and cold last winter and it developed bacteria.
Find any anti bacteria in your neighborhood garden supply and start treatment immediately. Be very careful it is poisonous. Do the treatment outdoors.
Your Vanda is dying....you might save it since majority of the roots are still healthy. The dark rings on the roots is a telltale sign that it is being infested.
Soak it first overnight in a basin of water then start the treatment. The dried sponge like layers of the roots will absorb better if you soak it first.
Then hang it outdoors in the breeze to let it dry then repeat again the next day.

[orchids44]

Bud,

I have Physan 20, will this work?

Thanks for responding to my issue.

[BettyE]

I like Buds' advice. I do see a couple of brown roots which, (if the plant were mine) I would cut off. After cutting off anything dead, I always spray with alcohol, then put sulfur on the cut. The trimming of dead roots, etc. would be done last, right before re-potting. Just my opinion...BettyE.

[FSUOrchids]

I think those knotted roots are a telltale sign of thrip damage.

[Vanda lover]

I have a vasco roll on red that also has roots like these. I guess I'll try spraying it, if I can find something to spray it with. I heard brown listerine works but I have never tried it.

[Bud]

She is right use Listerine the classic one not the blue. Try the home remedy first before the poisonous ones. Physan 20 is a disinfectant you can use to prevent any future infestations. But since your plant is already infected; use the Listerine.
The last picture you showed disturbed me because it shows brown spots at the base of the leaves before it falls and it is also spreading to the leaves above it.

---------- Post added at 11:22 PM ---------- Previous post was at 11:14 PM ----------

Alternate the treatment with hydrogen peroxide. Listerine today then peroxide tomorrow. The reaction of peroxide is to release oxygen and leave water behind so its a winwin situation. I don't know but bacteria doesn't like peroxide. It kills them.

[Vanda lover]

Thanks Bud. I'm going to look more closely at my vasco in the morning and I happen to have brown Listerine on hand.