It works, as do other plants with strong, lemon-y smells (like citronella and geraniums) but the problem with those concoctions is that they don't last long. I've used them a lot in the past and at most they'll last an hour or so. Their problem as far as I can tell is that they evaporate quickly and once you can't smell them anymore nor can the mosquitoes, and you're fair game again.

DEET is so effective because its effects last a long time. In my experience it basically lasts until I wash or go for a swim, so for as long as it's on my skin. Granted, since I normally use it in the summer months when I'm likely to swim daily it doesn't last more than a day in practice, but that's already far longer than any of the plant-based ones I've tried.

I don’t understand why sharing an objective study with good news would be downvoted, someone please explain?

I’m not saying you have to use it; it’s good news for people who have concerns about other chemicals. It works—less effectively, but it works.

“Repellants containing (..) oil of lemon eucalyptus have also been found to be effective.”[1]

[1] Iowa Department of Health, “Controlling Spread of West Nile Virus“ https://hhs.iowa.gov/health-prevention/providers-professiona...

The parent comment was clearly not intended to replace DEET, only to add an oil that provides the missing repellent odor if this were to become a real issue. For all I care, the oil could intentionally be altogether useless for killing bugs. After all, even if DEET doesn't repel bugs, it still is intended to kill the bugs that intake it.

Also, the oils in question work reasonably for bug control, just for a lesser duration, requiring more routine reapplication. When you say they do not work, that's true only for the gap between how long the oils work versus how long ≥35% DEET works. And the concentration matters acutely for both.