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Greetings. I have a bunch of these guys on the nasturtium that's under my (((buddleia))). I don't mind them munching a bunch of leaves, as long as it doesn't disrupt the blooming much or completely wreck the looks of the plant. The nasturtium is purely for looks.
I'm fairly certain it's pieris brassicae, which like munching nasturtium, according to Wikipedia.
Since there are only a couple of them and the whole point of the buddleia is to attract butterflies, should I just leave them?