so, nobody ever got this on their leaves?! i find it hard to believe...

Are the leaves getting thinner? I had a fungus come through and affected "everything " from azaleas, poinsettias, camellias, to my Hoya. It's the only one I have left, out of 3 different varieties of Hoya. I am in total panic mode.

do you have a pic of different leaves affected?

Let me give you the obligatory disclaimer first - I am not an expert. That being said, it looks like a combination of sun stress coupled with over watering. I think the plant was very stressed. I would move it to a shadier area, if you're in florida the humidity is already up there, and hold off on the watering a little. I'm thinking it will recover but it's going to take some time. I would also swap the houseplant and orchid bark percentages, with more (40%) orchid bark and 20% houseplant soil. The soil tends to hold a lot of water, and with temps up, humidity high it's not going to dry out. Check the roots, make sure there's no die back (I suspect there may be) and if so, trim them to viable roots, and replant in the new mix. Then lightly water and let them sit for a week or so prior to watering again.

I hope this helps. Best of luck with it. Stay safe, stay well and enjoy the holidays.

i actually checked the roots, they were fine. i also put it in slightly shallower pot and put it on a heat mat. it's healthy overall. my hoyas are grown in passive hydro on water-wicks, the bark does not wick, so i cannot increase it. the main problem is that i had 2 plants with robust roots and good growth , so i put them into an 6" pot. normally i don't go bigger then 4" pint deli-tub. that's what my large hoyas are in for sev years. also i usually keep them on the window sill in west window in sev hours of sun even in summer, but that's up north in NJ.

i kept them on the balcony for sev months in sep-oct in FL in part-shade and they were fine until i combined them..that i think is the problem. and now i removed all leaves with discolorations..may be 12-15 ..which is a lot. i have 2 other hoyas carnosa on the same balcony: one reverted green in 1qt tall yogurt tub: doing fine, not a large plant for pot size.

and my older carnosa that dehydrated last spring. it's recovering but slow. they are fine.

so i don't know...i'm keeping this one indoors on the heat mat for now, until it regrows.

i'll give it azamax drench: it's overall systemic and anti-bacterial too. and spray it with neem and hope for the best. i have several, but these were the newest most robust cuttings. i liked them most.

this is the plant now

my hoyas in passive hydro never had overwatering problems due to small pots, of course.

but i leave them for months on wicks unattended and they are fine.

one of my hoyas years back: it's in my ideabook growing in pint deli tub on wick: about 2? years from 2.5 inch pot with small cuttings

I find this is a problem that occurs with the KP form of carnosa. I suspect it's very sun sensitive because of the variegation. If I grow it in full shade, it doesn't seem to happen AS MUCH, which makes me think it's a little more than that... Here's one I started and have been growing in no sun at all for a couple years and it still has one leaf with a spot...

The rest looks fine. It is a frustrating issue with an otherwise gorgeous species!

Denise in Omaha

my markings are grey: they totally look like mold... but it's not on the surface, it's inside the leaves. i remove all the leaves with it: i've been growing these for 5-6 years and this never happened before. but they have not been growing in 85-87F part-sun either. totally indoors so max 75F in summer and much cooler 65F in winter.

i do think that it' s sun + high temps combined that contributed to this. just worried that it's goin to dig in...

but it's on just 1 plant, so i can definitely take more cuttings from the older healthy (at this point) plant, which was in same outdoor conditions but in smaller 4" pot being at least double the size.

just wanted to note that the leaves were not pitted in any way and it took me a few weeks to notice because upside is clean, only the underside shows these markings. they are not round, there is no halo like for bacterial, the color /outline do not change.

so the upside was in the sun, not the downside (where the marking are) : that puzzles me.

but i just found some people say that happens with higher temps/humidity/light intensity.

so i'll experiment. if it's better to keep them indoors in FL too i wont put them outside.

i can't really shade them on south balcony..too complicated to constantly move them around.