A marauding weed in check

The aquatic fern Salvinia molesta, known as salvinia, is one of the world's 'greatest' water weeds, as it chokes lakes and waterways. However, the introduction of the tiny South American weevil Cyrtobagous salviniae is one of the main biological weapons keeping the weed in check. The weevils have been successfully introduced into Sri Lanka, Papua New Guinea, India and South Africa.

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