Anonymous --- In our old place, when fruit flies came it was often at this time of year and they seemed to die back once the cold weather hit. But I'm afraid I don't have any ideas other than letting your trailer freeze inside!

Sheila --- This isn't actually ours. It's on a friend's house. I think they purchased it as a kit, but I'm not quite sure from whom. There's some kind of lure inside the wooden box. As you can see, there are insects inside...but there is also fresh carpenter-bee damage nearby. So I'm not sure if I can recommend it!

They're actually good pollinators. You can set out unpainted weathered wood blocks for them to use. Maybe even drill some starter holes to attract them away from where you don't want them. Here in the Pacific NW I have 2 honeybee hives and a half dozen mason bee houses with pre-drilled wood blocks. The mason bees are a little different in that the pupae overwinter in cocoons, as opposed to the carpenters where the adults over winter. The mason bee blocks come apart so they can be cleaned to cut down on the mites, and the cocoons can be removed and stored in the fridge over the winter to be set out in the spring. I usually get a few hundred cocoons every year. See the Crown Bees website for info on solitary bees: crownbees.com