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The adult fly lays eggs in the medium that turn into tiny white/yellow maggots that can devastate a plantís roots. Nilnat contains microscopic crystals which are eaten by the maggots and then swell up, perforating the gut wall and killing the maggot. If you see adult flies apply Nilnat immediately. Use of Nilnat as a preventative is highly recommended; by the time you notice flies, significant damage may already have been done to your roots. Non-toxic and can be used right up to harvest. Makes approx. 2000 litres.