Pitting under the leaf of a Phalaenopsis.
 

A friend of mine's orchid has these dents / pits under it's leaves. I was searching the forum and it seems like there maybe a few possibilities but nothing looks exactly like her orchid .

I told her to keep it away from her other orchids and that I would ask you guys if that's okay.

Thank you!!

classic case of 'asking for a friend'! :rofl:

I've had similar and come to the conclusion it is old damage from pests. It didn't progress and in due course the leaves were dropped.

:) Actually I am. She's 78 and isn't actually internet savvy .

Well I hope it's just pests.

That looks a lot like spider mite damage. She should check her other plants for this.

I just got back from visiting her on Sunday. I didn't see any spider mites but a nurse said that she found snails so she sprayed the roots with peroxide and repotted . She also said that one of the leaves above it was mushy and she had cut it off .

I sprayed the leaves with a weak solution of isopropyl alcohol , water and hand soap as you had told me before when I had spider mites.
The next time I visit her I will do it again.

Thank You

Hi!
I saw the picture of Cymbalines phal. And down in the comments it was said that the damage on the leaf is from mites-pests.
I have the same dimples-spots that have a bit of whiteness inside. But i dont think that is from mites because i put that phal late last year in the spare bedroom and it was not heated in hopes to induce a spike but in about 2 day it had these spots. I assumed it was cold damage. I brought the phal to my usual spot and no leaves had fall off or the spost hadnt spread. Only one leafe got a bit yellow on top and i cut it half off now its ok-no yellowness anymore.

So my question is are you sure is spider mites damage that? Because no other phals have that spost-so it wasnt trasmitted.

Best regards Shani

I wasn't certain whether there are spider mites. But they can cause damage like that and they can kill a plant quickly. So it's always important to be sure they aren't the cause of a problem.

Small pits with white spots may be mealybug infestation. Look at the plants with a magnifying glass.

Well to mine phal that happened in november i think so if it were mites it would died already right?

And also no its not mealybugs. I meant green-white not fluffy white :oops_sign in the Cymbalines picture the pits are also brighter and more green-white looking.

SO can that be cold damage? As i assumed or its something else?

I don't think it's cold damage. I don't know what it is. It looks like previous insect or mite damage.