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manyntiny black dots on the leaf undersides

Posted by greentoe357 7b NYC under lights (My Page) on
Tue, Apr 15, 14 at 1:07

The subject line is pretty descriptive. Some of my hoyas are getting very many pin-prick sized black dots on the undersides of some leaves.

This is Hoya ridleyi. Old leaf is on the left (not my growing), new one is on the right.
ridleyi old left new right underside

I noticed the black dots, while present on the whole backside of the leaf, here form a thick horizontal stripe on the bottom half of the leaf. No idea why that may be. Any guesses?

Tops of the leaves look fine to me:
ridleyi old left new right

The new leaf is much more flexible, but that is entirely normal till it matures and becomes more turgid, I understand.

Here is a backside of a Hoya pottsii leaf:
pottsii black dots

Black dots ate not as dense but still present. This hoya is doing it on both old and new leaves.

Hoya micrantha is doing it too. Black dots are particularly noticeable on new leaves, but some old ones also have them to very small degree. No picture, but you get the idea.

And there are other species, too, where it's less prominent but present.

What should I read into this?

Follow-Up Postings:

RE: manyntiny black dots on the leaf undersides

Nothing bad - those are totally normal. Some of my Hoyas get them too, and it seems to be a characteristic of certain species, because the same species keep popping up with this question. (Like in this thread here).

Hoyas will also get black dots from sun damage, (often after being misted), on their tops. And spots can, of course, mean fungus or pests. But the kind you've pictured are innocent. You will notice, as time goes on, that there is no browning or yellowing associated with these - as would be the case with "bad spots." In some plants, they go away as the leaf matures, but I don't think my micrantha ones go away, or mitrata, and many others I can think of. I think they're quite pretty. Enjoy!

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