I recently discovered that my houseplants have a bit of a fungus gnat problem. But literally within hours of me putting these sticky traps out, a dozen of these little buggers were trapped and unable to move. The traps are very sticky and sturdy, unlike some others. It has now been nearly 24h and the traps have caught lots more. I already no longer see any of them hovering around my plants, though I will leave these traps put to see if any late sleepers will turn up... and join their brethren on the yellow patch of doom. All in all, highly recommended!