Post a question about them a dozen times on their forum. It will drive them crazy and they'll flee.
Controlling Palmetto aka American cockroach: good sanitation and habitat reduction, along with vacuuming, surveillance, a baiting program, and some sealing of cracks can usually quickly reduce or eliminate a cockroach population.
By the way, larvae is not a stage in the lifecycle of the cockroach. It is eggs, nymph, adult. Nymphs resemble the adult. If what you are seeing is indeed a larvae (wormlike), your infestation may be a different type of insect.
Here's a good read for you on cockroaches:
Here's another with some photos you can compare yours with: