Fleas require moderate daytime temperatures to thrive outdoors. Because fleas are most prevalent in areas with high humidity, coastal regions tend to suffer large populations of outdoor fleas, according to the University of California. When treating a pet for flea infestation, the outdoor living and roaming area must also receive treatment to break the flea's life cycle or the pet can easily become reinfected.
Determine which areas of the yard are infested with fleas and if the flea population is high by placing white socks on and walking around the yard. The fleas will jump on the white socks. The number of fleas clinging to the white socks will give the homeowner an idea of exactly how severe the outside flea population is and which areas contain the largest populations.
Areas of Infestion
Common areas that suffer the most severe infestation in a yard will be where the pet spends the majority of its time. Focus on where the pet sleeps, eats and runs. Areas of the yard used for elimination will also generally hold a high population of fleas.
During the heat of summer many fleas will venture a short distance from the location that the dog resides to seek refuge from the summer heat. They will be most prevalent in locations where they can seek shade--such as in the flowerbeds, along foundations, beside fence line, beneath decks or under shrubs.
Focus treatment on the areas of the yard that have fleas. The entire yard rarely needs to receive treatment, according to The University of Kentucky. Apply sprays directly to the areas of infestation for the best results.
Use chlorpyrifos or permethrin for adequate and quick control. Both pesticides are easily applied using a handheld sprayer. Using IGR's (insect growth regulator), such as methoprene or pyriproxyfen, offers long-term control by preventing newly hatched fleas' growth cycle from occurring. This breaks up the flea's life cycle and renders it unable to breed or produce new fleas.
Applying Borax to the yard using a seed spreader helps to kill fleas. Regular watering also destroys the flea's eggs prior to hatching. Also remove all foliage around kennels, dog houses and dog runs so the fleas have no where to hide from the summertime heat.