What smell do cockroaches hate?

Cockroaches hate several strong smells that disrupt their ability to find food or irritate them, with most disliked smells including peppermint, eucalyptus, citronella, and bay leaves, though smell alone does not eliminate colonies permanently and should be combined with baits and sanitation. Peppermint oil with its strong menthol scent is one of top smells cockroaches hate because it can disrupt scent trails and irritate their sensory receptors, and diluted peppermint oil sprayed around entry points, baseboards, and under sinks can deter foraging temporarily, though effect fades once dry. Eucalyptus oil and citronella also have strong odors roaches dislike. Bay leaves contain eucalyptol that is said to repel roaches, with some people placing bay leaves in cabinets, though scientific evidence is limited. Other smells roaches hate include cedarwood, tea tree oil, lavender, and citrus peels, plus white vinegar and bleach smells they avoid. However, German cockroaches which are small light brown roaches common in kitchens are highly adaptable and will tolerate unpleasant smells if food and moisture are available, so repellent smells alone rarely solve infestations and can cause scattering where roaches move to other areas rather than leaving. Pest control professionals emphasize that while these smells can deter short-term, lasting control requires integrated pest management including thorough sanitation by storing food sealed and cleaning crumbs, sealing cracks with caulk, fixing leaks, and using slow-acting gel baits containing fipronil or hydramethylnon placed near hiding spots that roaches eat and carry back to kill entire colony within days to weeks.