The Lake County General Health District (LCGHD) conducts mosquito spraying in most of the municipalities in Lake County that are densely populated. Spraying reduces the risk of mosquito-borne diseases and provides for a more comfortable summer environment. Since mosquitoes may be infected with both La Crosse and St. Louis Encephalitis Virus, and human cases with this disease have been identified in the Health District in the past, mosquitoes can be considered a public health nuisance. The public health significance of mosquitoes has been amplified by the recent spread of the West Nile Virus. The Health District is licensed through the Ohio Department of Agriculture to apply pesticides for the purpose of mosquito control. If you have any further questions that are not answered from this web site, please contact our offices on weekdays between 8:00 a.m. and 4:30 p.m. at (440) 350-2543 or (440) 918-2543.

Mosquito Spray Schedule for the 2019 Season

The same information as below may be obtained by calling the Health District Spray Schedule Hotline, 24 hours per day at (440) 350-2088 OR (440) 918-2088.

Spray AreaSpray Date
Concord 15-B
Eastlake 8-A
Eastlake 8-B
Fairport – Grand River
Kirtland 12-A
Kirtland 12-B
Madison 10-A
Madison 10-B
Mentor 1-A
Mentor 1-B
Mentor 2-A
Mentor 2-B
Mentor 3-A
Mentor 3-B
Painesville Twp 9-A
Painesville Twp 9-B
Painesville City 11-A
Painesville City 11-B
Willoughby 7-A
Willoughby 7-B
Willoughby Hills

Cancellation for Mosquito Spraying

The spray schedule can change daily. Any of the following conditions can delay or cancel spraying:

  • Number of adult mosquitoes trapped at specific trap site location below the threshold value for spraying
  • Winds greater than 10 mph
  • 50% or greater chance of rain
  • Temperatures cooler than 55 degrees
  • Ozone action day
  • Mechanical failures

Areas to be sprayed are determined by the number of mosquitoes trapped at our trap sites, complaints, and past history.

Pesticides Used by LCGHD

PesticideSafety Data SheetPurpose
Duet LabelDuet Label SDSAdult Mosquito/Night Spraying
Golden Bear 1111 LabelGolden Bear 1111 SDSLarval Mosquito/Standing water
5% Skeeter Abate Pellets Label5% Skeeter Abate Pellets SDSLarval Mosquito/Standing water
Natular G30 LabelNatular G30 SDS Larval Mosquito/Standing water
Natular T30 LabelNatular T30 SDSLarval Mosquito/Standing water
Natular XRT LabelNatular XRT SDSLarval Mosquito/Standing water
VectoMax FG LabelVectoMax FG SDSLarval Mosquito/Standing water

Helpful Pesticide Links

Vector-Borne Diseases
Midges and Mayflies
Mosquito Tips for Homeowners

In Ohio, mosquitoes can transmit viruses such as Eastern equine encephalitis, La Crosse encephalitis, St. Louis encephalitis, and West Nile. Depending on where Ohioans travel, there are other mosquito-borne diseases that can be contracted and brought back to Ohio. Those diseases include Chikungunya virus, Dengue fever, Japanese encephalitis, Malaria, and Yellow fever. To learn more about each of the mosquito borne diseases, visit Ohio Department of Health – Mosquito-Borne Diseases.

Helpful Links

For information on the mosquito life cycle and how to avoid exposure to bites, visit Ohio Department of Health – Fight the Bite.

For frequently asked questions on mosquitoes, from questions about AIDS transmission to the best repellents, visit American Mosquito Control Association – FAQ.

Midges, Muckleheads, or Muffleheads

It doesn’t matter what they are called, these mosquito look-alikes are an annoyance when lakeshore communities are swarmed by these harmless, non-biting insects.  Midges are attracted to lights in the evening and cling to screens and windows.  They are hatched from the lake when the water warms up in the spring and again when the lake cools down in the fall.  The midges live for only five to ten days. Midges do have a positive purpose, however, as they provide food for fish and other aquatic animals.


Mayfly is the common name for delicate insects that emerge in large numbers from lakes, streams, and rivers, and are attracted to bright lights. They are between one-half and one inch in length and have a two- or three-pronged tail.  As a flying adult, they cannot feed, but form male and female swarms that mate over water. After mating, the males die; the females live a few more hours, and deposit eggs in water to start the next generation.  Mayflies are an important food source for trout, and fly fishing lures are often designed in their image.

Tips for Homeowners

Homeowners can treat small areas of standing water in their yards by using vegetable cooking oil or Ivory liquid dish soap.  Both will clog breathing tubes and kill mosquito larvae. The best way to protect yourself from mosquitoes and mosquito diseases is to get rid of places where mosquitoes can lay their eggs to make more mosquitoes. Follow these simple steps:

  • Dispose of tin cans, old tires, buckets, plastic swimming pools that are not being used, plastic covers, or other things that can hold water.
  • Make sure that your roof gutters are not clogged.  Clean roof gutters in the spring and fall.
  • Clean swimming pools, outdoor saunas, and hot tubs.  Use chlorine according to the manufacturer’s instructions and keep pools, saunas, and hot tubs covered when no one is using them.
  • Empty and change the water in birdbaths, fountains, wading pools, rain barrels, and potted trays at least one time every week.
  • Fill or drain puddles, ditches, and swampy areas.  Get rid of, drain, or fill tree holes and stumps with cement.
  • Get rid of standing water from cisterns, cesspools, and septic tanks.
  • Get rid of standing water in areas where animals eat.
  • Water your lawn carefully so that water is not standing for many days.
  • Fix torn screens or get new ones.

It is best to stay indoors from sunset to sunrise when mosquitoes are most likely to be around.  If you must go outdoors at these times:

  • When you are outdoors, use insect repellents that have DEET, Picaridin (KBR 3023), Oil of Lemon Eucalyptus (PMD), or IR3535.   Follow the directions on the package.
  • According to the United States Centers for Disease Control, there have been no reports of problems with pregnant or breastfeeding women using repellents with DEET or Picaridin.
  • If you are concerned about using repellent products on children you may wish to consult a health care provider for advice or contact the National Pesticide Information Center (NPIC) through their toll-free number, 1 (800) 858-7378 or
  • Wear long-sleeved shirts, long pants, and socks when you are outdoors, especially from sundown to sunset.
  • Replace outdoor lights with yellow “bug lights.”

Call the Lake County General Health District at (440) 350-2543 if you are worried about standing water.  Remember the Health District needs permission to enter private property.