Treatment
for House Fly
Work the source first. Removing larval habitat is the preferred suppression method, since baits near trash only help when housekeeping stops new flies from breeding. Layer in physical tools: seal entry gaps, fit screens, hang sticky ribbons indoors, and set inverted-cone or baited traps where useful. Use insecticides only as a last resort, after the non-chemical measures and always per the product label. Source: https://ipm.ucanr.edu/PMG/PESTNOTES/pn7457.html