When one of my lettuce plants started wilting, I pulled on it and found I could just pull it straight out of the soil with no resistance. On the roots, I found these maggots. (You may need enlarge the picture a bit.)
Does anybody know what these are?
How likely is it that those are why the lettuce started dying?
Can they spread to other nearby potted plants?
What can you do against these?
SF nematodes and sticky traps can reduce their numbers but they will always be present. BTi application to all of your pots will eliminate them in a few weeks.