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Nemasys® Biological Leatherjacket Killer contains beneficial nematodes (naturally occurring microscopic worms) which seek out and kill leatherjackets. Nematodes attack the pest by entering natural body openings, releasing bacteria that stop the pest from feeding, which quickly and safely kill it. The nematodes then reproduce inside the dead pest and release a new generation of hungry nematodes, which disperse and search for further prey.