Actually, Gnatrol depending upon your definition, is not a chemical. It is composed of spores and crystal of toxin produced by a bacteria, Bacillus thuringiensis var. israelensis (also called bti). So far as is known, it is completely harmless to mammals, fish, birds etc. It only affects the larval stage of some insects and for this particular variety that includes mosquitoes. It is widely used by many cities in their mosquito abatement programs. I have no personal experience using this for control of fungus gnats. The sticky traps will work and another thing to consider is to do a search for "beneficial nematodes". In this case, you are looking for Steinernema feltiae. These are microscopic round worms and also only affect the larval stage of certain insects. I have used this for control of fungus gnats and while it worked well, there are some drawbacks to its use. Being a live organism, it has a very short shelf life and must be refrigerated continously until time of use. Also, you may have to spray them more than once since they tend to get flushed out of the pot when you water. Once established however, they do a good job since each gnat larvae they infect releases hundreds to thousands of new nematodes when they die.
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