Thrips
 

Dear orchid enthusiasts, please help me.
I had some trouble with thrips in spring, I took my orchids outside and treated them over the summer, I sprayed them all before bringing them inside for the winter and now almost 2 months later I found thrips on 3 of my orchids.
I have around 50 orchids and 10 succulents in the room and I'm in Europe.
How do I get rid of them for good?

The key is the pesticide application regimen.

Most pesticides only kill adults, leaving eggs and juveniles to mature and reproduce, which is why a single treatment is not enough.

Using a pesticide labeled for the critter in question, spray all exposed surfaces of all plants to dripping AND drench the potting medium. Repeat that two additional times at one-week intervals.

Those subsequent treatments increase the likelihood that you’ll kill the newly matured bugs before they get a chance to reproduce.