check for bugs. That is a problem in my greenhouse. It only takes one mealy bug to suck the life out of the bud.
You need to use a magnifier to see the small juvenile forms.
You can cut the rhizome and just do not disturb the roots. That should allow a new plant to start on both pieces. Some Kelp Max could help as well.
You are dividing the plant with out re-potting it.
check out side 5 in OrchidWiz 7.2 under Paph. Lowii. The spots look similar. The label on the photo says Tropical Exotique.
I agree that it is not a standard lowii. Could it be a tetraploid? It looks more robust than some other plants.
I would repot the orchid and give it more water. The leaf tips should not be dying.
It could also be hungry. The new leave look small. Dust the cut surfaces of the leaves with cinnamon or bordeux mix.
The leaves are a beautiful dark green. It can indicate the plants are starved for enough photons.
Brighter light, closer or longer duration of electrical light could help.
Too heavy shade cloth or dirty windows, if growing in a greenhouse can be the reason.
If you can measure the light they...
I suggest that you unpot the plant. It looks like the media is stale, (not enough air) and your roots are probably bad. The white spots look like bugs to me. Mealy bugs (soft scale) goes through 3 instars before it becomes an adult. You will need a magnifying lens to see them in all their...
I am glad your plants are improving. I have a similar problem and have given an emergency dose of norwegian saltpeter (Calcium Nitrate) along with epsom salts. 1 tbl spoon per gallon each. I also have increased the amount of fertilizer injected with my watering. I have removed my shade cloth...
I would gently take the plant out of the pot and see what is really going on with the roots. It looks good but perhaps there is a problem.
If there are bad roots they can not absorb the nutrients that you are applying. I use both Epsom salts (for mg) and Plaster of Paris for (Calcium and...
My phrags are enjoying the potting mix that Ray described. Gro-dan and large sponge rock, half and half.
I would urge you to try that for your phrags. Of course, use the K-lite fertilizer with ro water if you have it.
Correct potting solves many problems.
I recommend a 60% aluminet shade cloth. That goes along with my triple wall poly-carbonate roof. That has 80 % transmission.
You do have to consider the entire sandwich. I take the shade cloth off for the months of Nov. Dec. Jan. The angle of the sun is low enough so the plants do not get...
Adding on to the above message. It could also be that the calcium is precipitating out of your fertilizer mix. The university of Michigan fertilizer does have calcium in it, but if it is mixed too strong the calcium can turn to rock (limestone) and become unavailable to the plants. So the...
In my collection, those leaves would be showing a shortage of Calcium at the leaves. Calcium is needed every day by the plant. It does not move from the old leaves to the new leaves.
Now you need to discover the reason that calcium is lacking at the leaves. It could be bad roots. It could...
On some of my plants the brown leaf tips are caused by a shortage of calcium. The plant needs it every day for cell growth. It is not trans-located from old leaves to the new leaves. Your rain water and RO water may be short on calcium and or magnesium. First Rays K-Lite fertilizer has cal...