Predatory mites (Neoseiulus cucumeris) are used to manage thrips in greenhouses. Neoseiulus cucumeris feeds on thrips on leaves and in flowers. It attackes first instar nymphs. this predatory mite is sold in bulk with a bran carrier or in little paper envelopes that contain bran and feeder mites.
This photo shows using paper cups being used to protect predatory mites from overhead irrigation water.