Nearly 30 invasive fruit flies have prompted a produce quarantine in Los Angeles County as state and local officials try to stop the fly from spreading to more fruits and vegetables. State agriculture officials say it’s the first quarantine ever in the Western Hemisphere of the Tau fruit fly, which is native to Asia. Officials say the fly was discovered in the unincorporated area of Stevenson Ranch, likely brought by a traveler bringing uninspected produce into California. They're urging residents not to take their produce outside their homes. It threatens to destroy crops or prompt more pesticide spraying if its spreads.