UPDATE: Downstate Mosquito Spraying This Week


Update 3/21/24: Weather permitting; the Delaware Mosquito Control Section plans the following insecticide application for mosquito larvae located in flooded forested wetland habitats. This application could take place during the daylight hours on Friday, March 22nd  via helicopter (registration number N2268W and/or N862M).

Application of Vectobac12AS (liquid BTI) to control mosquito larvae in the following areas:

In Woodside and Selbyville.

Near Viola, Felton, Dagsboro, Frankford, and Rehoboth Beach.

For notification purposes, spraying will be done in the following spray zones:92, 99, 100, 107, 154, 155, 176, 188, 189, 191, 201, and 202.

Update 3/20/24: DNREC’s Delaware Mosquito Control Section plans the following insecticide application for mosquito larvae located in flooded forested wetland habitats. This application, weather permitting, would take place during the daylight hours tomorrow Thursday, March 21st via helicopter (registration number N2268W and/or N862M) in the following areas: Application of Vectobac12AS (liquid BTI) to control mosquito larvae in the following areas: In Woodside and Selbyville; also near Viola, Felton, Dagsboro, Frankford, and Rehoboth Beach.

For notification purposes, spraying will be done in the following spray zones: 92, 99, 100, 107, 154, 155, 176, 188, 189, 191, 201, and 202.

Previous Post on Downstate Spraying Tuesday and Wednesday This Week:

Mosquito spraying will take place during daylight hours on Tuesday, March 19th and Wednesday, March 20th. Tuesday’s spraying will be done by helicopter over flooded forested wetland habitats in Woodside and Selbyville and near Viola, Felton, Dagsboro, Frankford and Rehoboth Beach.

Wednesday’s spraying will be by airplane to control mosquito larvae in and near Georgetown and near Harrington.

Additional information from DNREC:

Application of Vectobac 12 AS (liquid BTI) on Tuesday, with helicopter (registration number N2268W and/or N862M) and spray zones – 92, 99, 100, 150, 151, 154, 155, 163, 176, 188, 189, 191, 201, and 202.

Wednesday’s spraying is by airplane (registration number N263JC) and spray zones – 116, 150, and 151.

All insecticides to be used are registered with the USEPA for mosquito control and will be applied according to USEPA approved label instructions.  The USEPA has determined that the insecticides to be used do not pose unreasonable risks to human health, wildlife, or the environment. 

For further information, please visit the Mosquito Control Spray Information site or view the Spray Zone Map.


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