Hi everyone. I'm new here, and I'm here because I cannot figure out what is going on with my Hoya Kerrii. I'll attach several photos.

Some history - I got this plant about 4-5 months ago. Let it acclimate in a spot for 2 months or so and then reported in a terracotta pot with a well draining soul mix - sand, perlite, potting soil. I then gradually moved it into a southern window where it would get good light. I water it when it's dry - about every 2 weeks right now (I'm in Pennsylvania). The temp in my house is always between 68-72, I have a humidifier that keeps it at about 65% in the next room. I asked in another forum and someone said it may be an issue with the roots, so I imported tonight and everything in the root structure looks perfect. No sign of rot. Not holding onto too much moisture. Nothing of significance to note.

So … what is this? It seems to be progressing, affecting more leaves. It does not rub off, but the leaves still feel stable attached to the stem, and they haven't really withered at all.

Thanks in advance. And please be gentle, this is my first hoya.

Hi Krispvisions, to the site!

Hoya's require consistent warmth and high light and I wonder if your Sweetheart Hoya (Hoya kerrii) has been subjected to cold drafts from the window? Cool temperatures with moist, humid conditions (as you've described) can cause fungal issues and I may very well be wrong, but that's what your plant looks to be exhibiting to me. The terra cotta pot and the soil mixture sound okay but the combination of low temperature and low light may be a problem.

My windows aren't drafty at all. They're double paned and we'll insulated. It was in a south facing window which gets lots of light. It's only about 45-50% humidity in that room. I was thinking it was fungus too but I don't know. Do you have any suggestions on fungicide I could try?

Welcome

the only thing i can think of is... that new growth stem seems to have a lot of distance between leaves, compared to the other stems. Often that means it's not getting very much good light.
The other thought is that I find hoyas are more tolerant of drier soil between waterings than they are of being damp all the time.
Also, i would not fertilize at all while this issue is going on. (could this be fertilizer burn?)
And I'd snip off the affected leaves and safely dispose of them (no composting).
Maybe one of these things applies here?