While not having a great problem with narcissus bulb fly at the moment, it doesn't hurt to plan for a battle. I've wondered if banking a small amount of diatomaceous earth around the stems/foliage would do in the migrating grubs and perhaps keep the fly from laying eggs in the first place. As the foliage shrinks, the earth would fall into the cavity, protecting the now exposed parts. The visual impact should not be too objectionable. I know that diatomaceous earth disperses into the soil fairly quickly, but it only has to last a couple or three months. Also, I don't know if it would damage the plant material; it didn't seem to when tried as a slug deterrent (not real successful, that). Dave Brastow Tumwater, Washington -USA- (7A)