No I haven't seen any worms or signs of the butterflys. I also have my cabbage and collards covered. I'm thinking that it may be fungal.Cabbage worm eggs look something like that but they are more of an oval shape. Some seem too big also. It is that time of year for them the worms to start munching so keep an eye out. They will all of a sudden decimate your cabbage.
Look like circles on the surfaceAre the white dots 3 dimensional or circles laying on the surface? Can't tell from the photo.
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