There are some beneficial insects ( predators) that can help control thrips, depends what type if system you have and what crop. The predatory mite Stratiolaelaps scimitus has been proven effective, also Atheta coriaria ( Staphylinidae).

Using predators is a preventative method, not a knock down one, so you have to introduce them before thrips population get too high

Use of white sticky traps could be a good option for managing thrips.

We have used Beavaria bassiana with some success to control thrips in greenhouses.  Peter

I did it again!  My screen is jumping about. It should be Beauveria

Recently, an Indian group used the fungus Lecanicillium psalliotae in the biocontrol of Cardamom Thrips Sciothrips cardamom. For more details, please find the attached file. Regards

Thanks Islam