I've been growing Kale under a 600W LED grow light for the past few weeks. My plants were doing quite well and I'd begun hardening off the oldest two to prepare them for transplantation. After 8 days of this, I noticed spots appearing on the leaves. They began on one as yellow spots, which then turn brown and appear dead.

spots on kale leaves

The weather here (Seattle, WA) became sunny quite suddenly so I assumed perhaps it was sunburn, despite the 8 days of hardening the plant already experienced, perhaps combined with some underwatering.

I noticed similar spots (seen below) appearing on a plant that is still under the grow light and has never seen the sun. This plant is much younger and seems to be more severely afflicted. Perhaps this indicates a bacterial culprit? Any help is appreciated!

younger kale with similar spots

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