Fruitfly trap lid

thingiverse

Humanity designed a device that fits snugly onto the top of a mason jar with a ring/collar screw top mechanism in place. I just happened to have these 1-cup (250ml) jars readily available. To fill one, start by pouring enough liquid into it to reach about halfway up the side, adding just a single drop of dish soap and mixing in equal parts vinegar and water. Apple cider vinegar is highly recommended, but other types work equally well; I opted for a diluted solution only because I was running low on my supply and chose a more affordable option. Next, place the lid with its conical holes pointing downwards over the mouth of the jar, securing it firmly in place with the ring. Leave this setup wherever you notice your fruitflies are gathering, and be prepared to witness an astonishing outcome. The underlying theory behind this method is that vinegar serves as a powerful attractant for fruitflies, while the unique shape of the lid's holes allows them easy entry but hinders their escape. The dish soap reduces the surface tension of the liquid mixture, ensuring that any fruitfly that lands on it will inevitably drown. In a past experiment, I added a chunk of rotting watermelon to one of these traps and observed that the fruitflies found it particularly appealing. Alternatively, I've used a slurry made from flour and yeast with moderate success, but vinegar remains my preferred choice for its impressive effectiveness in eliminating fruitfly infestations.