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CMMCP Aerial Larvicide program 2018



Map of proposed application areas for Billerica 600 acres. Application completed April 18


Map of proposed application areas for Chelmsford 600 acres. Application completed April 18


Map of proposed application areas for Boxborough 840 acres. Application completed April 20


Please check back for application results



Click here for a YouTube video from 2009


Operational reports (pdf):


2007 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017

Please note; this is NOT A PROGRAM TO SPRAY FOR ADULT MOSQUITOES. This program will use a granulated bacterial product ONLY OVER WETLANDS confirmed to have active mosquito larvae. This is the same product we have used for over 25 years in member cities and towns as part of our standard larval control program.


A legal notice was placed in the Boston Globe per 333CMR 13.04(7) on Feb. 7, 2018.



To reduce the emergence of spring brood mosquitoes, notably Ochlerotatus excrucians, Ochlerotatus abserratus and Ochlerotatus canadensis in the towns of Billerica, Chelmsford & Boxborough.



Using helicopter applications of Bacillus thuringiensis israelensis (Bti), a non-reproducing bacteria used for the control of mosquito larvae, the total numbers of spring brood mosquitoes can be reduced. This is the same product we have used for nearly 30 years as part of our regular ground larval program. Maps of the treatment sites using GIS software will be prepared for the contractor. These sites have been selected using data collected by the CMMCP staff.



Although we have identified potential areas of mosquito breeding, we will only target these areas after confirmation is received from field observations (pre-surveillance). All areas will be sampled using established procedures and protocols in the mosquito control Generic Environmental Impact Report:


       An average of 1 mosquito per dip over 10 dips will be used as a threshold to determine if an application in that area is warranted.

       We will have at least 1 dip station per 250 acres as a monitoring device.


Once confirmation is received, the area will be designated for treatment. We will generate a report on this program using the pre and post treatment data we collect. This report will be used to show efficacy, and will also be sent to other neighboring towns to encourage their participation next year, since this type of program is most effective on a regional basis. Considering the similarity of topography in many towns, we feel confident we can reduce spring brood numbers, thus reducing the dependence on our adulticide program.


These applications typically happen in the third week in April, but this is dependent on the larval stage (the target stage is the 2nd to 3rd instar) and weather factors. Site visits will determine the actual date(s) of application. I would anticipate this application to take two to three days, but this will also be subject to the current weather conditions.



Specific wetland types over 1 acre have been outlined on the maps. These wetland types (wooded swamp deciduous, conifer & mixed; shallow marsh; shrub swamp) have been identified as the preferred habitat for the target species. We will field check these sites, and any sites under 5 acres that we identify as not suitable for this application will be removed for consideration and monitored and treated if necessary as part of our regular, ground larval control program.