Flea Biology & The Fall Flea Surge
The Twenty-Sixt Annual
George H. Muller Veterinary Dermatology Seminar
November 3 - November 10, 2010
Michael Dryden DVM, MS, PhD
Professor of Veterinary Parasitology
Department of Diagnostic Medicine & Pathobiology
Kansas State University
Manhattan, Kansas
Fleas are a common and important parasite of dogs and casts. They are voracious blood feeders consuming up to 15 times their body weight in blood daily and female fleas use that blood to produce 40 to 50 eggs each day. So it does not take very long before a flea infestation can get completely out of hand. These fleas can cause allergic skin disease, transit tapeworms and produce anemia in our pets. It is important for the health and well being of our pets that we eliminate these harmful parasites.
In order to achieve the first goal of flea control (providing pets relief from the existing fleas), proper administration of a flea product is essential for the rapid and prolonged kill of those fleas. We often do not understand how important it is to properly administer a flea product. The correct technique should be explained and demonstrated to the pet owner. Remember, correct administration varies depending upon the products selected. Next it is important to understand that veterinarian recommended products are going to kill all fleas that are currently on the pet and may take from 4 hours with some products or as long as 24 hours with others before all existing fleas are dead.
Many of these flea products not only kill the fleas that are currently on the dog or cat but also provide for prolonged residual activity, often killing fleas for up to one month. In addition some products can also provide prolonged activity against flea eggs, by killing the eggs or preventing eggs from developing or being laid. It is important to understand how these monthly products are going to help us achieve our second goal of flea control, preventing further infestations of immature fleas in the environment while driving the current infestation to extinction.
The pet owner must understand that it often takes several weeks to eliminate a flea infestation. That is because all flea infestations of dogs and cats originated from a flea infested environment and it takes time to eradicate the immature stages living in the carpet or outdoors. There are some basic aspects of flea biology that can have a direct impact the success or failure in the battle against fleas.
Proper administration of flea products to all dogs and cats every month means no more fleas reproducing and no more eggs dropping into the environment. Simply if fleas cannot reproduce they will go extinct in the home and yard. But if the clients misses treating one pet, skips a monthly treatment or applies the product incorrectly this allows fleas to live and lay eggs, continuing the infestation. It is important to remember that these products do not repel fleas and they do not kill fleas instantly. It often takes several hours, maybe more even up to a day, after these fleas have jumped on treated pets to be killed by the residual insecticide. Therefore clients should expect to see some fleas on their pets for the next 1 to 3 months and occasionally longer.
As good as the new veterinary labeled flea products are, there may still be a need for direct environment control with some severe flea infestations. Such as washing pet bedding, vacuuming carpets, washing area rugs and application of insecticides into the indoor and outdoor areas. This might include the use of pump sprays, directed aerosols, total release aerosols (commonly referred to as Bombs) or the services of a professional Pest Management Specialist.
While many pet owners think of the summer as the "flea season", n many temperate climates flea populations often peak in the fall. The "Fall Flea Surge" often causes increase pressure on flea control programs often leading to perceptions of failure and resistance. The reasons for the fall flea surge are multifactorial and not well documented. But some of the important aspects of flea ecology do provide some insights.