FRESNO, Calif. — Dozens of foreign insects and plant diseases slipped undetected into the United States in the years after 9-11, when authorities were so focused on preventing another attack that they overlooked a pest explosion that threatened the quality of the nation's food supply.

At the time, hundreds of agricultural scientists responsible for stopping invasive species at the border were reassigned to anti-terrorism duties in the newly formed Homeland Security Department -- a move that scientists say cost billions of dollars in crop damage and eradication efforts from California vineyards to Florida citrus groves.

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