What could this be?

[ILS]

Thank you for your advise. When I sprayed the orchids today I noticed little tiny critters run for it. I also noticed real thin spider webbing. I went ahead and sprayed my other orchids and noticed the webs on some of them as well. Even though the leaves looked healthy.

I'm going to start treating them all routinely.

For the yellow one I'm wondering if it does not like the fertilizer or it is too strong for it. I just started fertilizing it a little over a month ago and it became yellow maybe two weeks ago - I'm hoping just changing the medium it is in and regular waterings will help. Maybe move it indoors too for the time being.

Thank you. Thank you! I really hope it works.