When Not To Treat
for Drain Fly
Skip the insecticide. Once the breeding film is gone the flies die out on their own, and spraying adults without cleaning the drain solves nothing — new flies keep emerging from the source. Source: https://wpcdn.web.wsu.edu/wp-puyallup/uploads/sites/415/2014/12/PNW_PPDrainFlies.pdf Source: https://extensionentomology.tamu.edu/wp-content/uploads/2017/09/Drain-Flies-Publ.-E-184.pdf Never pour insecticide down a drain, and never mix drain chemicals: bleach with ammonia releases toxic gas (Virginia Tech), and bleach after a caustic cleaner can produce chlorine gas (Texas A&M). Source: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/ENTO/ENTO-414/ENTO-414.pdf Source: https://extensionentomology.tamu.edu/wp-content/uploads/2017/09/Drain-Flies-Publ.-E-184.pdf