Works great on Gnats!!!
Recently I had a bad infestation of Gnats, my grow is in 5 gallon fiber pots with living soil and the plants are in flower so I did not want to spray. I top feed a 1/2 cup of the mustard seed to each pot and within 12 hours the gnats are gone. Only time will tell if the gnats are gone but be aware the mustard smell is strong so it is advise to have a exhaust filter.