Callback Cures: Focus Flea Efforts on Immature Stages
To troubleshoot flea callbacks, focus on the life stages that are most abundant. It’s estimated only about 5 percent of a flea population is made up of adult fleas. The other 95 percent consists of pupae (10 percent), larvae (35 percent) and eggs (50 percent). Make sure the management program being provided to the client reflects these numbers, and focus your troubleshooting efforts on the largest segment of the population.
from Pest Management Professional.