Ladybugs DO eat thrips.
Ladybugs, or lady beetles, are considered a beneficial insect due to their penchant for a variety of garden pests including thrips. Both the adult and the larvae will consume thrips, aphids, mealy bugs, mites, scale insects, and white flies. If you are interested in enticing ladybugs into your garden, they are attracted to pollen and nectar plants.
Additional natural predators that feed on thrips include lacewings, spiders, the predaceous mite, dustywings, and the minute pirate bug.
“Beneficial Insects.” North Carolina Cooperative Extension: Home. N.p., n.d. Web. 21 Nov. 2011. .
“UC IPM: UC Management Guidelines for Citrus Thrips on Citrus.” UC Statewide IPM Program. N.p., n.d. Web. 21 Nov. 2011. http://www.ipm.ucdavis.edu/PMG/r107301711.html