Agricultural crews in Santa Clara County, Calif., began putting out traps and bait station as soon as the first three guava fruit flies were caught and identified in San Jose recently. There's no time to waste -- the insects native to South Asia lay their eggs inside fruit and a few flies can turn into tens of thousands of the destructive pests in just a few weeks, said Santa Clara County Agricultural Commissioner Joseph Deviney. An invasion could decimate the region's produce exports, he said, if foreign countries start refusing shipments because of the flies.

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