Mosquito Control


The Mosquito Control Section provides a direct service to approximately 2,100 communities in 16 Maryland counties. The primary goal of this program is to prevent the occurrence of mosquito-borne disease in humans, pets and livestock. 

Mosquito control is an economic necessity in some parts of Maryland dependent on outdoor tourism during the summer. The program relies on surveys and monitoring of the larval and adult mosquito populations to coordinate control activities. Control techniques include breeding source reduction, public education, biological control and insecticide applications from aircraft or ground equipment.

To find out more, call Mosquito Control at 410-841-5870.

To learn more about the program, check out the Mosquito Control Program AgBrief. ​

Mosquito Control Spray Activities

A significant component of the Mosquito Control Section's operation involves adulticiding--more commonly referred to as "spraying." Our Ultra Low Volume (ULV) Spraying Program is an effective method to control populations of adult mosquitoes.

There are two primary categories of spray activities, and it is important to note the difference:

1. Routine Adult Mosquito Control

During mosquito season, the department will conduct routine ULV spraying in participating communities on a weekly basis. Each community is assigned a specific night of the week.

Community schedules are available by county on the Mosquito Control homepage. For more information on routine ULV spraying, click here​.

2. Unscheduled Mosquito Control

In addition to routine activities, we work closely with the Maryland Department of Health and local health departments in response to any concern of mosquito-borne illness. Once health officials determine a need for response, mosquito control personnel will survey the affected area to eliminate potential breeding zones and determine if there is a need for further treatment. 

If there are enough adult mosquitoes present in the area, personnel will use backpack sprayers to apply Talstar P Professional—a bifenthrin-based adulticide—onto foliage where mosquitoes rest in order to control adult mosquito populations.

In certain cases, the state may determine a need for unscheduled truck-based ULV fogging in response to a public health concern. 

In the event of an unscheduled spray, the department will issue public notice. All notices will be posted on the MDA website and on Twitter @MdAgDept. The department also maintains a Mosquito Spray Alert Hotline: 410-841-5737.​

​In the event of a disease-related unscheduled spraying, any existing spray exemptions in the affected​ areas will be temporarily suspended. 

For information about the types of pesticides used in truck-mounted and aerial spraying, click here.​​

For information about how to prevent breeding mosquitoes in your yard that could carry Zika, see our Zika Awareness Page​​
A Note About Non-Target Organisms

We are very concerned about the effects of our activities on non-target organisms, like honeybees and bats. We only conduct truck mounted spraying or misting at night. Bees are not active at night. The droplets in the spray have an extremely small diameter. The surface to mass ratio of these droplets is such that these droplets do not leave residue on surfaces. They are like tiny parachutes. When they are pulled down by gravity, drag keeps them from falling. The point is that these droplets do not land or stick on surfaces. When bees become active the next day and crawl across surfaces, those surfaces do not have any pesticide from our spray. The droplet size averages 15 micrometers. There are 1000 micrometers in a millimeter.  We must have our machines tested, by law, twice a year. We announce all unscheduled sprays on @MdAgDept​ ​(Twitter) and through press releases. If you would like to receive notice of all UNSCHEDULED spraying, send your email to us at: See scheduled spraying here. ​

Contact Information

Brian Prendergast​
Program Manager​
Mosquito Control Administration

​Telephone: 410-841-5870

Use this form to report increased mosquito activity in the following counties: Anne Arundel, Baltimore, Cecil, Charles, Dorchester, Harford, Howard, Kent, Prince George’s, Queen Anne's, Somerset, St. Mary's, and Worcester Counties 

NOTE: The department may only inspect properties if the request comes from the owner or resident.

Communities Participating in Mosquito Control Services

Listed by County. Click link for schedule information.

Other county lists will be posted as they are finalized.​
  On the Web 


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