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In Hartbeespoort, Gauteng millions of tiny insects are hard at work, eradicating the water hyacinth suffocating the dam. It’s an invasive South American weed that, when left to bloom, depletes the oxygen in the water, killing fish and preventing boats from using the dam. For years, the Madibeng Local Municipality has tried unsuccessfully to eliminate the weed, but it always grows back. Now, scientists have introduced water hyacinth planthoppers: hostspecific natural enemies of water hyacinth. But this new attempt to kill off the weed hasn’t been without controversy.

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