i have never heard of that defiantly sounds interesting might give that a try or if you do, stop by my YouTube and shoot me a message with the results.
TheItalian Garden

Interesting. There are two caterpillars that hit brassicas. One comes from the white moth and the other from a brown moth not butterfly shaped. http://www.toxicfreenc.org/organicgardening/cabbage_worms.html#.VQzkAv0tF-Y

Hi little_minnie,

You are quite right, and I did have an infestation of both types of caterpillars on my brassica plants last year. I believe there were a greater number of cabbage worms compared to cabbage loopers, though. I could be remembering it wrong, and it may not even matter (for example, a decrease in one population may lead to an increase in the other).

An admittedly-lazy search of Google only turned up results of people on forums claiming that the cabbage moths are territorial. Nothing official from sites I would consider a "trustworthy" source of information, such as extension services and university agricultural websites.

Regardless, I am still going to try this myself considering little work and potentially large benefit it might serve. My plants were heavily infested last year, so even a decrease in the amount of worms would be nice. A complete absence of them would be ideal, but not realistic. ;) I will post my results when my plants get growing later in the season.

Thanks for your comment.

I've been noticing the white cabbage moths flying around my garden a lot lately, so I finally decided to hang up my decoys in an effort to repel them away from my kale plants.

I hung them on my tomato cages (above), and around various other places in the garden. I forgot to put the plastic around the decoys to protect them from the rain, so they probably won't last too long. I will post again in a few days to report on how effective (or not) they are.

Well, I know it hasn't even been a whole day yet, but I don't think these paper cut outs have any effect on the real moths. I've been in my garden all morning and I've seen several of them flying around my kale and landing on them... completely ignoring the pieces of paper flapping in the wind.

Whenever I see two real moths fluttering in the garden, I do notice that they tend to fly into one another. I always thought it was a mating thing, but perhaps it is territorial aggression. Either way, they don't seem to notice my fake moths at all.

The idea sounded good on paper, but I'm not so sure that it works in practice.

Seems like BT is the only effective remedy for this problem, aside from the tedious hand picking. I prefer not to spray anything in my garden, but I completely understand why anyone else would.

Row covers work wonders. :)

Rodney