PepperWhisperer said:Fungus gnats details and control methods: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7448.html
Highlights from the Biological control section:
Nematode species Steinernema feltiae
Predatory mite species Hypoaspis miles
Bacterium species Bacillus thuringiensis subspecies israelensis (Bti)
I'm dealing with these vile creatures now. Applied Bti 3 days ago, too early for definitive results.
It takes awhile to get results, as it only effects on stage of their lifecycle. It took roughly 3-4 weeks to gain control, supplementing with sticky traps to catch adults.