Magellan
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I had some of those earlier this year. They were chewing the stems around the buds! Little fockers! I believe that they are the larval stage to the white cabbage moth - google it. I saw one flitting around my plants a week before I noticed the pillars. The moth will land very briefly and deposits one little egg on the leaf each time it lands. I tried tenting with garbage bags and inflating with pure CO2. that worked but was a pain in the butt. So I went and got Spinosad and BT alternating weekly. That worked like a charm. One of them kinda stinks like garlic.