In article ,
says...
There is a variety of BT that will be effective on gnat
larvae, or you can repot the plant in "clean" dirt.
water.

BT?


Bacillus thuringiensis (BT) if a bacteria that
attacks different insects...some varieties attack
different flies (mosquitos, gnats) others will target
caterpillars and another beetle.

http://www.ghorganics.com/BTI_For_Fungus_Gnats.htm


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Neat site:
http://micro.magnet.fsu.edu/primer/j...ienceopticsu/p
owersof10/

Lar. (to e-mail, get rid of the BUGS!!