Caterpillars. Keep looking.

I am unaware of any caterpillars doing that to beta plants. But I have seen rabbits or juvenile groundhogs do that.

glib, the animals you mention don't typically carefully gnaw the flesh of the foliage, leaving the veins in tact. However, caterpillars will! Our original poster needs to look carefully for the beet armyworm or other such critters, at night with a flashlight.

Thanks for the tips! Whatever-it-is has been ignoring my half-grown lettuce in the next row, so I figure it's probably not rabbits. I'll do another search and maybe spray with some water-soap-cayenne mix. Thanks!

You are right, they do a rough skeletonization, leaving the main vein, but if it is a neat job of eating around the veins then it is something else.

OK, so I found one bug on my chard. It looks like ladybug larvae, but more orange and a bit shorter. I've been looking at google images for awhile and can't find it! Any ideas?

My chard is getting eaten all the way to the white vein and can't seem to find anything, How can I stop whatever is eating the chard from eating it? Can I spray something? I prefer organic solutions.

Check on Leaf Miners.