Is it possible to find beneficial mites in Thailand? That eat problematic ones? Such as cucumeris

I'm not sure, but ask at this office, which is associated with the Dept of Ag biological control program. 

If you're in the south, they have a Surat Thani office but I don't have that info. 

 

This is pre-pandemic contact info, I'm not sure of current status of this program or if this office is still functional and responding. 

 

Chon Buri Pest Management Center

Government office in Pattaya, Thailand

Address: 15 Moo 11, Tambon Nong Prue, Amphoe Bang Lamung, Chon Buri, 20150, Thailand

Phone: +66 38 231 271

Dr Thiwa, director

 

You can also consider other methods and materials for organic program compatible pest managment. Post here with your region, host plant, growing conditions, and specific pest concerns with photos, and you may get some useful tips on alternatives. 

 

Chiang Mai University has one of the better agricultural/horticultural depts that could shed light with information and legitimate contacts.