This is cabbage from last year. There are 2 kinds of cabbage worms in my backyard: the imported cabbage worm, Pieris rapae, which is hatched white, turns green by eating your cabbage family plants, and becomes a white adult.
The other, the cross-striped cabbage worm, Evergestis rimosalis, is striped bluish-purple, black, and green. It would be pretty if it weren't pooping chewed-up cabbage pellets on your Swiss-cheesed plant. It likes to dig into heads as they form, to make catching it or spraying for it more difficult. I pick them off daily, sometimes twice, and most days this time of year get 20-40 off 13 plants. Things are getting Swiss-cheesy out there even though I'm catching many of them before they've eaten enough to get pigmented. What to do? I keep picking. Bt is supposed to kill them. I haven't tried it.
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Gotta love those edus.
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