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How Do Fleas Spread? Making the Cocoon, the Larva Molts and Forms Inside the Home, Pets Have Preferred Places a White Pupa

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How Do Fleas Spread? Making the Cocoon, the Larva Molts and Forms Inside the Home, Pets Have Preferred Places a White Pupa What are fleas? How do fleas develop? your pets hang out. The specks are evidence Fleas are insects that are parasites of Adult fleas lay eggs that hatch into white worm- of eggs and dead fleas. mammals and birds. The most commonly like larvae with brown heads. They are tiny and found flea pest in homes is the cat flea. Dog difficult to see (about 1/50 inch). Cat flea larvae fleas can also be a problem, but most often have chewing mouthparts that they use to eat it is the cat flea (Ctenocephalides felis) that specks of dried blood. When they are full, the is found to be infesting both dogs and cats in blood turns them nearly purple. They move North America. They are small (about 1/12 quickly, disappearing into carpets, pet bedding, inch), wingless, dark brown or black, six-legged etc. insects that look flat from side to side. Fleas have been known to jump as far as 13 inches, Mature flea larvae crawl away from the area about 200 times their own body length. where they developed and work their way into cracks in floors or under the edges of pet beds, Cat flea egg, feces, larva and adult. rugs or carpeting and spin loose, white, silken cocoons in which to pupate. Shortly after How do fleas spread? making the cocoon, the larva molts and forms Inside the home, pets have preferred places a white pupa. The pupal stage is completed to sleep or rest. These places are often the within seven to ten days, but adult fleas may “hot spots” for flea infestations. Outdoors, remain inside their cocoons for months. A fleas build up in kennels, doghouses and number of warm, humid days stimulate the other preferred resting places, such as under Adult cat flea. adults to emerge as does the presence of a a particular bush or porch. host nearby. The adults are ready to feed as Why do fleas bite? soon as they leave the cocoon. Adult fleas are parasites that feed on the blood Outdoor flea infestations need animals to of the host animal by biting and sucking blood. How can you tell if you infest and warm, humid conditions. Flea Cat fleas will bite and feed on dogs, cats and larvae need moisture or they easily dry out humans, and on outdoor animals such as have a flea problem? and die. However, they can not survive in rodents, foxes and opossums. Most feeding on If your pets are continually scratching them- standing water. a pet takes place when it is sleeping or at rest. selves, there is a good chance they have fleas, particularly if they spend a lot of time outdoors. Wildlife in urban areas may harbor flea Some people and pets are more sensitive If you notice a salt and pepper-looking mixture in populations. Raccoons, chipmunks, squirrels, to flea bites than others. When fleas feed, your pet’s bedding, it could be flea eggs and opossums and rodents inhabiting areas near they secrete saliva that can cause an allergic digested blood from adult fleas. Examine your the home also contribute to the spread of reaction with severe itching and skin lesions. pet’s skin, especially around the neck or the fleas. Pets will always investigate areas in The flea bites can leave small, hard, red welts base of the tail. Look for adult fleas crawling their backyard where these animals live. This on the skin. Allergic animals may lose hair on the pet, scabs caused by flea bites and flea behavior facilitates flea reinfestation of pets. and will bite or scratch an irritated area until dirt, which looks like small, black to rust-colored, it becomes raw. Heavy flea infestations may comma-shaped bits of dandruff. Fleas can remain dormant for long periods of severely affect an animal’s health, can cause time waiting for the right conditions to emerge. anemia, and can be fatal to puppies and Fleas may travel from pets to humans. When Fleas may emerge after you return from a kittens. While grooming, cats and dogs may you wake up in the morning, you may have little winter vacation when the house warms up. ingest adult fleas that carry tapeworm cysts. red, itchy welts from flea bites. You may see little Fleas are more of a problem in hot, humid specks on your sheets, floor, socks and wherever weather. What do you do when you To control fleas indoors: ■ Vacuum floors, rugs, furniture and other sur- find fleas? faces where your pet sleeps, eats and sits. #9: Questions and Answers about Fleas If you have a flea problem, you must treat This will pick up adult fleas, eggs, and larvae. your pets. Consult your veterinarian for the Also vacuum crevices around baseboards, be- best methods to control fleas. Some pet hind doors, and under furniture, cabinets and products are not as safe as others. Be very appliances. Toss the vacuum bag out immedi- careful about which pesticide product you ately when done. choose. Pets may ingest pesticides that have ■ Wash all pet bedding in hot water and dry in a Questions been sprayed or dusted on when they groom hot drier, if possible, at least once per week themselves, and some pets are more sensitive ■ Steam clean or shampoo carpets, rugs and to pesticides than others. furniture. You may notice fleas after clean- and Answers ing because they may hatch from the warmth Make sure you use products that are labeled of the water. Keep vacuuming, washing and for flea control on your particular pet. Do cleaning until the fleas are gone. About Fleas not use a cat product on a dog and vice In addition to cleaning and vacuuming, several versa. Follow all label directions. It may be insecticides are registered for controlling fleas necessary to wear gloves or other protective indoors. IGR products are generally the safest equipment when applying the product. Keep type of insecticide products to use. They can be children away from flea control products, and applied with a hand sprayer or aerosol can, or as do not let them handle pets that have been a total release aerosol (i.e., flea bomb or room Guidelines to recently treated. fogger). Follow label directions carefully on these help you solve Newly developed “spot-on” formulations products to protect your family’s and your pets’ are safer and easier to use than traditional health. The pupae are unaffected by the insecti- flea problems in insecticide dusts, sprays and shampoos. cide so you may still see some adult fleas emerg- These new products contain insect growth ing for up to two weeks after the treatment. your home. regulators (IGRs) that are less toxic to people Consider outdoor controls when flea infestations and pets. IGRs are also available in flea collars. are repeatedly being reintroduced. To control fleas outdoors: Special flea combs are available to help you ■ Remove debris and low-hanging vegetation to remove fleas from short-haired pets. Bathing open areas to sunlight and help reduce fleas. your pet also helps to drown adult fleas. ■ Close off crawl spaces, areas under porches, and openings into basements and attics where Prevention is the best approach to manage pets or wild animals nest. fleas. Pets can receive a flea preventative on ■ Treat kennels, dog runs, doghouses and a regular basis in the form of a pill or food ad- perimeter fences. Random sprays are not as ditive. These products can prevent the estab- effective as granular products targeted to treat lishment of flea populations in homes. infested areas. New, May 2007. Developed by the MSU Pesticide Safety Education If fleas do become established, it is important Program, B18 Food Safety and Toxicology Building, Michigan State Community IPM Education Series University, East Lansing, MI 48824 (http://www.pested.msu.edu) and to identify flea “hot spots” and concentrate the Michigan Department of Agriculture. MSU Pesticide Safety Education Program your control efforts in those areas. MSU is an affirmative-action, equal-opportunity employer. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, Extension Bulletin E-2986 religion, age, disability, political beliefs, sexual orientation, marital status, or family status. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Thomas G. Coon, Extension Director, Michigan State University, East Lansing, MI 48824..
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