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puzzling Swiss Chard damage

daninthedirt (USDA 9a, HZ9, CentTX, Sunset z30, Cfa)
last month
last modified: last month

I'm getting some leaf damage on my Swiss Chard that is puzzling. No pests in evidence, and I spray regularly with Bt. I also treat my collards with Bt, and have absolutely no damage on them. Something preferentially likes Swiss Chard, seems to be immune to Bt, and is hiding well. Ideas?

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