Geez, it was just yesterday that I was admiring the carrots (and harvested one runty forked carrot) -- then today I happened to notice the carrot leaves have many aphids... yellowish aphids in various life stages. (seems to be a different type of aphid than the ones on the cucumbers)
Some of the leaves upon close inspection are looked tired/bothered/not-quite-right. A few leaves are distorted/skinny. Harvested one carrot with a distorted leaf -- it was beautiful and delicious, a nice size, not huge but pretty perfect!
It seems aphids might not do too much damage to mature carrot plants, so I guess for now I'll just do nothing.
What a day -- discovery today of cucumber beetles, rotted kale, and carrot aphids, augh!!
p.s. / edit: Harvested a sprig of curly parsley this evening and lo and behold, a couple of aphids there too. (but much less density than the carrots -- so far, at least)