Notice of aerial larval control application

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Notice of aerial larval control application

In accordance with 333 CMR 13.04(7) (a & b), please consider this as notification of the potential spring (and summer if conditions warrant) aerial applications targeting mosquito larvae in the larger wetlands of the District.

The Norfolk County Mosquito Control District will potentially be conducting helicopter applications of biorational larvicides to control mosquito larvae, should conditions warrant.  Go to the Districts website for targeted spring wetland locations.  The summer wetland locations will be posted before any application should it be warranted.  These potential applications will be conducted over specific large wetlands in the Towns of:





These applications will be conducted over a likely 2 to 4-day window, lasting only 2 days, anytime between April 18, 2023, and April 28, 2023. As always, the weather in the spring is unpredictable. For this reason, the District cannot pin down actual application dates with any more accuracy at this time. We will send out further notices as the application date approaches.

The trade name of the granular formulation of Bti to be used is VectoBac GS (EPA Reg. No. 73049-10). This is not a “spray”. For further information contact David A. Lawson, Director at (781) 762-3681 or the Boards of Health in the towns listed above. Information is also available on line at

Respectfully submitted,

David A. Lawson
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