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Science 17 September 1999:
Vol. 285. no. 5435, pp. 1841 - 1843
DOI: 10.1126/science.285.5435.1841
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News Focus

BIOLOGICAL CONTROL:
Fighting Fire With Fire

David Malakoff

WEST BOULDER RIVER, MONTANA--As the menace posed by biological invaders grows, many scientists and governments are fighting fire with fire by importing natural enemies of exotic weeds and pests. But the "good" exotics may become problems themselves, attacking nontarget native species or reshuffling ecosystems in unwanted ways. And even biocontrol researchers admit that the long-term fate of introduced agents is often unknown.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)