A couple of facts about fruit flies.... Lifespan: 30 days. Number of eggs laid by a single female: 400 to 500!. Eggs hatch in 12 to 15 HOURS! (yup, that's HOURS) Time from egg to adult: 7 days! Normally I do not complain about fruit flies. Heck, stained hands and fruit flies are just badges of honor for the diehard winemaker. This year, however, the fruit flies have been really bad. While pressing there were only a handful of them to deal with (as usual), but love must have been in the air because now they are really bad. Thank goodness I finished pressing and had the tanks sealed before they ever got to this point. With the tanks sealed, and the winery completely hosed down (well before the flies got so bad) the flies have become more desperate. They like to gather at the fermentation traps on wine that is just finishing off or where they can smell the fermentation. I clean out the traps twice daily (making sure to cover the openings so none of them can get in). Last night, when I came home from work, they were all over the place. They were so bad, that I opened the doors to the winery and took a box fan in hand to blow them out. This seemed to work well and it looked like I got rid of 2/3 of them. I then needed to take a hydrometer reading on a slowly fermenting cab. I used the spigot at the bottom of the tank to pour off a 400ml sample (rinsing ithe spigot afterwards). I then used 250ml of the sample to take my reading, leaving 150ml in the beaker. After I took my reading and washed the hydrometer and the the measuring cylinder I went to wash out the beaker, there were DOZENS of the buggers doing the backstroke in the sample. That's DOZENS of the suckers in about 5 minutes! Even without a food source they live for 30 days! I found these on amazon and figured I would give them a try. I will let you know if they work better than a home made trap. How are the flies with the rest of you?????