I edited your quotation above to "warmth," but I think we all know what you meant and are used to autocorrect "fixing" things for us in creative ways... ;)
I thought I was terribly clever when I wrapped a strip of packing tape around my infested flower pot sticky-side-out last summer, but I did not catch a single fly. I assume there must be something that smells or tastes good on the thingies that you buy.
Interesting. Thanks.
Yeah, the importance of good drainage and aeration--as simple and unglamorous as it is--is one of the biggest lessons I have learned for any kind of gardening.