Usually the whitish spots are environmental/sun damage from transplanting before hardening off properly. That's about all I can suggest. Is it on new growth? The plant will probably recover fine.

Agree environmental damage and nutrient deficiency. What have you fed them and how often?

Since you are using a potting soil and compost for growing them rather than a container mix you could also easily be over-watering them. Stick your fingers deep into the soil and feel around the root level for moisture before watering.

Dave

Thanks for the ideas. I would be slightly surprised if it is hardening off issues; they'd been outside for a few weeks in gallon container before moving up to the larger container. They did experience a small hail storm (fairly unusual for this area), and at the time, leaves were clearly damaged by that. The hail damaged leaves have fallen off already though. Moreover, damage has appeared on new growth.

I'll keep an eye on water. I've still only watered the one time, plus the bit of rain. The watering I did was when I transplanted them in the first place��"I should have made that clearer in my first post.

I gave them each a Dr. Earth 5-7-3 fertilizer (http://www.groworganic.com/dr-earth-tom-veg-herb-573-12-lb.html) when I transplanted to the larger pots. I have not given any fertilizer since.

Looks like sun and or wind burn.

Thank you all for the comments. It looks like you were all correct, and it was just sunburn after all. I am still surprised that they were not yet hardened off, given how long they'd been outside with partial sunlight, but now I know.