Are mosquitoes in the south suburbs carrying West Nile virus?
Some are. Cook County and Will County publish trap results, and the reports have named towns across the south suburbs, including Tinley Park, in recent seasons. A positive trap means a mosquito in the pool carried the virus, and the reports are the place to check current results.
The Cook County Department of Public Health pools results from several mosquito districts and the state, and it publishes weekly reports. Will County publishes its own trap results and asks residents to report standing water that stays for more than a week.
Positive results change from season to season, so a local figure from years ago is not a guide to this year. Check the current reports for the county, and treat any season with reported positives as a reason to clear the water on your lot.
Does a mosquito treatment reach the breeding water?
A barrier treatment reaches adults in the shade, but it does not replace removing the breeding water. Larvae grow in standing water and are not reached by a spray applied to the leaves, so the water is treated or removed as a separate step.
The two parts of the job support each other. Clearing the water cuts the number of adults that hatch, and the barrier reduces the adults that are already on the lot. A plan that does only one of them leaves a gap.
A technician explains which water sources can be removed and which must be treated in place, such as a pond or a standing drainage area. The choice is recorded on the visit notes.
Where do mosquitoes breed around a Tinley Park house?
Mosquitoes breed in any standing water that stays for about a week, which on a suburban lot means clogged gutters, the saucers under potted plants, bird baths, tire swings, tarps and low corners of the yard. A small amount of water is enough.
Gutters are the most common source on a house that is not cleaned regularly. A gutter that holds leaves and water is a breeding site on the roof line, and the downspout extension that discharges onto the lawn can leave a standing pool near the foundation.
Containers left out in the yard are the second source. An upturned bucket, a child's toy, a pool cover with a fold of water and a plant saucer all hold enough water for a generation of mosquitoes.
How long does a mosquito treatment last?
A barrier treatment usually lasts a few weeks, depending on rain, watering and how much the lawn is mowed. It is not a season-long solution, and it is most effective when the breeding water has been removed before the spray is applied.
Heavy rain and irrigation wash a spray off the leaves and reduce its effect. A follow-up visit is scheduled to check the coverage and reapply where the label permits, and the schedule is set with the homeowner.
A yard that gets a treatment and then holds water after the next storm will see mosquitoes return within weeks. The water removal is the part that lasts.
Do mosquito treatments affect bees and pets?
Treatments are chosen and applied to avoid open flowers, ponds and pet areas where possible, and the label sets the limits. A technician will tell you which areas are treated, when to keep pets and children off the lawn, and when it is safe to garden again.
Bees are most active on flowers during the day, and the barrier is applied in the evening or early morning on the shaded vegetation where mosquitoes rest. Blooming plants are avoided, and beehives or a neighbour's garden are discussed before treatment.
Ponds, fish and aquatic pets are a separate concern. A larvicide used on water is chosen for the setting, and the technician explains the precautions before any application near a pond.