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- 1). Wear white socks over shoes and pull them up to your knees. Walk through the lawn and check the number of fleas that attach to your socks as you go to determine where fleas concentrate.
- 2). Mow grass, trim shrubs and keep weeds down to expose flea eggs and larvae to sunlight, causing them to dry out and die.
- 3). Water the lawn thoroughly. Fleas usually live at ground level with grass as a protective shelter. Irrigation forces the fleas to climb up the grass, making it easier for insecticide to reach them. It might also drown some fleas.
- 4). Apply insecticide to the lawn, especially areas that your pets frequent. Some insecticides for outdoor flea control include bifenthrin, beta-cyfluthrin, cyfluthrin, esfenvalerate, permethrin and pyrethrins. For nonchemical control of fleas outdoors, release the parasitic nematodes known as Steinernema carpocapsae in the lawn. Follow the manufacturer's instructions because application rates and frequency could differ depending on the type and concentration of the active ingredient.
- 5). Treat the lawn using insecticide again in 30 to 45 days, using a different chemical in case the fleas have developed an immunity to the first insecticide.
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