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Aerial Application to Control Mosquito Larvae
Published on Apr 19, 2023 14:11

The Norfolk County Mosquito Control District will be conducting helicopter applications of the biorational larvicide Bti (Bacillus thuringiensis israelensis) to control mosquito larvae. These applications will be conducted over specific large wetlands in the Towns of:
Avon, Bellingham, Braintree, Canton, Dedham, Dover, Foxboro, Franklin,
Holbrook, Medfield, Medway, Millis, Milton, Needham, Norfolk, Norwood,
Plainville, Quincy, Randolph, Sharon, Stoughton, Walpole, Westwood,
Weymouth and Wrentham

These applications will be conducted over a likely 2 to 4-day window, lasting only two 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

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