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April 13, 2020 - May 1, 2020
All Day
Needham, MA 02492
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Board of Health - Norfolk County Mosquito Control District

Monday, April 13, 2020

The Commonwealth of Massachusetts

The State Reclamation and Mosquito Control Board

Norfolk County Mosquito Control District

144 Production Road, Suite C, Walpole, MA  02081

(781) 762-3681 fax: (781) 769-6436

Robin L. Chapell     Norman P. Jacques     Maureen P. MacEachern     Linda R. Shea     Richard J. Pollack, PhD



David A. Lawson


Caroline E. Haviland

Field Operations Manager

To:      Boards of Health  

From:    David A. Lawson, Director,

               Norfolk County Mosquito Control District

Date:    April 6, 2020                      

Re:     Notice of Aerial Larval Control Application

In accordance with 333 CMR 13.04 (7) (a & b), please consider this as notification of the pending aerial application targeting mosquito larvae in the wetlands in the District.

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:





These applications will be conducted over a likely 2 to 4-day window, lasting only 2 days, anytime between April 13, 2020, and April 27, 2020As 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 GR (EPA Reg. #73049-486).  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

In light of the Covid-19 outbreak and all the complications surrounding that, the NCMCD has decided to alter our ‘normal’ aerial application this year. We will be removing some wetlands that have edges that very closely abut neighborhoods. The intent of this change is to create a bit more of a buffer between the helicopters and the homes. We receive very few ‘complaints’ each time we conduct these applications, but one of the most common complaints is about the low flying helicopters over homes. With stress levels already heightened, and more folk’s home during the application, we felt this was a prudent step to take. Based on the best science we have before us, this reduction in acreage will likely have no effect on the outcomes of EEE and WNv this summer. This application is primarily an application to control the emergence of spring nuisance mosquitoes.

Respectfully submitted

David Lawson


Received & Posted with the Town Clerk's Office:  April 9, 2020 @ 12:32 PM