Hi-- Greetings from New Zealand. A few bulbs coming out here now, late in this exceptionally long and warm season here.... I am very concerned about fungus gnats because I am raising around 2000 seedlings of various Hosta. I have heard from friends in the US that there is a very effective predatory nematode available there I think it is Steinernema sp. Also in New Zealand we have someone here selling a predatory mite called Hypoaspis aculeifer. These and the Bti are especially interesting to me because I want to keep low my usage of poisonous insecticides. We do have the Steinema feltiae present in NZ, but no one seems to be growing it commercially. I have only used the Bti from mosquito dunks, and seem to have mderate success, as there has been very little attrition in my seedlings. I also let my mix dry out very on the surface between waterings, and water from the bottom of the pots. There are still fungus gnats present, though. Another possible solution I have heard of is called NilNat. Which is some kind of small particle the gnat larvae will ingest when incorporated into the soil mix by watering. I ruptures their digestive tract. One poisonous insecticide I have considered is called Dimilin, which is a growth regulator and though I have read of it's use on manure piles for fly maggots, it apparently can work on fungus gnat larvae, according to some growers of cycads here in New Zealand. Hope this info can be encouraging for anyone faced with the opportunity that fungus gnats provide.... in teaching us about some of the life in our soil mix. All the best, Larry Rueter, Nelson, New Zealand