Vanda care and root issues

I hope some one knows ! I have Four baby vanda the biggest is about six inches. The smallest is about an inch .
At their currant stage im use I tap water

 

Vandas are going to like humidity, mine have mostly perked up after I got a small greenhouse, where humidity has been reliably over 50%. You may want to look into growing the Vandas in vases, which help to increase humidity around the roots.

 

I really don't know what I would do in the house, but humidity should be up around 60% which is very hard to control in the house. My situation is of coarse different, I have a conservatory, which I only use reverse osmosis water for humidity control, and a mist system, even with that I drench my vanda roots every morning and feed every 2 weeks but once again you have to remember my conservatory is all glass and very bright

 

I will also add that vandas, for the most part, prefer VERY warm temperatures.

 

I have a couple dozen Vanda both species and hybrid. I do not grow them hot as I live in Canada. The key is the water temp when they get a shower. They flower their heads off for me.

Water begins to loose oxygen at about 18 degrees Celsius. By 20 degrees there is little oxygen and by 25 degrees (77 Fahrenheit) no oxygen.

In summer, my Vanda are outside and get watered daily. We only have a week or so of hot weather. They flower wonderfully for me.

In winter, they get adequate humidity by being in an open closet. There are no humidity trays under. They get regular intermediate house temperatures, nothing special.

Do not cut your Vanda roots. They can begin growing new tips from dessicated roots.

If the roots are dying and the leaves are suffering, consider a fungus, mold, or bacteria. I do not want to use strong chemicals in the house, I use baking soda sprays to rapidly change the pH which none of these like. In summer, when they are outside, I do use a strong chemical fungicide that I got from the hydroponic store. My biggest problem is fungus. Always on the hunt for a hint of Fusarium Wilt which I got with a shipment from Thailand. Fusarium will rip through my collection rapidly in winter if I am not vigilant.

 

Hi Matyas,

If the black spots are not scale (a sucking insect), then this is likely due to being dried out to the point of very dead. Growing under one of the spotted roots is another root that has dried up at the end. This is the kind of root that will start growing again, not necessarily from the same tip, but along the root itself.

I grow a lot of orchids hydroponically. The ones, this summer, that are doing best are hung over the flood table. They have a homing devise for water! There are many, many, many growing tips coming from the bottom of roots as well as side branching of the roots. Some plants have light green tips, others white tips, and yet others are brown. The colour of the tips is entirely dependent upon the plant.

As to your brown spots, I would cut those out.

What is the black entwined in the mass? If those are roots, I would be worried. That is what Fusarium Wilt looks like in the centre of the root ball. Are you loosing bottom leaves?