Two medflies were found in California just two weeks after the state said it had wiped out an infestation that lasted nearly 16 months and cost $52 million to fight, agriculture officials announced.

"This is a revolting development," E. Leon Spaugy, Los Angeles County agricultural commissioner, said Wednesday. "I had hoped we could get through winter without finding any."Spaugy said the latest outbreak could have been caused by residents bringing illegal fruit from outside the country.

The unmated female Mediterranean fruit flies were trapped in residential neighborhoods in Upland and nearby Rancho Cucamonga on Nov. 15.