Hi, I have brussel sprouts, and I have an order of broccoli and purple broccoli coming in soon. Let me know if you haven't already got them :)

If it's cabbage worms, the standard defense is to use Bt. I only grow a dozen or so brassica plants at a time (broccoli, cabbage, brussels sprouts) so I've been able to just handpick any caterpillars I find and not bother spraying. I also cover young plants with a wire cage covered in tulle to protect them when they are small. If you make your cage big enough, you could keep them covered all the time; that would also keep out the cabbage worms. If it's slug damage, try putting out low bowls of beer in the evenings and see how many you catch. You could also go out at midnight (not sunset) with a flashlight and see if there are any on the plant. I finally resorted to slug killer (Sluggo, etc.) and was able to take care of them with a single application. (Though I keep an eye out for new damage and can always apply more.)

Thanks for the replies. My mind is spinning with possible culprits. I haven't found any bird poop near my plants and where they are located it would be hard for the birds to reach. Flea Beetles are a strong possibility as is the Cabbage Loopers. I linked the Flea Beetle and the damage it causes. It sure describes something very similar to what I'm seeing. I had them on my cucumbers and corn before but haven't seen them or any bug near my Sprouts. I'm gonna keep a close eye on them tonight and tomorrow....hope I catch whatever it is in action. Thanks for the info on the organtic pesticides as well. I'm gonna look into it. Here is a link that might be useful: Flea Beetle

Without a picture, my guess would be cabbage worms or loopers. They are green caterpillars that are surprisingly difficult to find on the plants. Spraying with Bt will kill them. Rodney