During each of the four stages of the flea life cycle, fleas are resistant to different chemicals. For best results at killing fleas in all stages, use products that contain an insecticide as well as an insect growth regulator, such as the Knockout or Siphotrol sprays available from Entirely Pets.
Eggs are laid on your pet, in the hair coat, and then fall off in your house when your pet comes inside. Flea eggs are resistant to most insecticides, but can be controlled with growth inhibitors. In the home, another effective way to eliminate flea eggs is with intensive cleaning and vacuuming. See our page on home flea control for more information.
Flea larva develop inside your home and feed on flea excrement that fall out of your pet’s hair. Larva can be controlled with insecticides, borates and growth inhibitors.
Flea pupa develop from the larvae, after the larva have spun cocoons for pupation. Pupa are very resistant to chemicals and harsh environmental factors. They can also lie dormant for many months before they emerge as adult fleas.
Adult fleas usually emerge from the pupae when a host pet is around. They are very mobile, but can only survive a few days without a host, or if they are dislodged from their host.
As you can see, fleas at different stages of their life cycle are resistant to certain flea control methods. For this reason, it’s important to attack all stages of the flea life cycle with different methods and products.
Do you want to know more about fleas and their life cycle?
Read our next articles about Life Cycle of the Flea. You will get even more in depth information on the flea life cycle. Additional information on the flea life cycle and behavior, with photographs.