That would explain perhaps why I have never had this pest amongst the snowdrops perhaps? Or any Narcissi at all. Is there anyone who knows more? Kind regards, Mark " Message du 07/04/13 18:16 > Objet : Re: [pbs] Nematode control of Narcissus bulb fly > > Most interesting ,Mark. > I have a patch of Narcissus pseudonarcissus here in Seattle, and the > Narcissus fly doesn't touch it either. I always assumed their is some > particular chemical make-up of the tissues that doesn't appeal. Some > Narcissus varieties are magnets for the fly, and others apparently have > some compound or composition to repel, or, at least not interest this pest. > Rick K"