Application to Reduce Mosquito Larvae

Published April 22, 2021 | East Middlesex Mosquito Control Project | Automatically Archived on 5/7/2021

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The East Middlesex Mosquito Control Project will be conducting a helicopter application of the biological larval mosquito control product Bacillus thuringiensis var. israelensis (Bti), to help prevent larval mosquitoes from becoming biting adults. The application will take place between April 26, 2021 and April 30, 2021. A helicopter flying low directly over the wetlands will apply a dry, granular formulation of Bti. Residents do not need to take any special precautions for this application.


Bti is a natural bacterium found in soil. The EPA classifies Bti as relatively non-toxic.  Bti is considered a target selective and environmentally compatible product that affects mosquito larvae and a few closely related aquatic insects in the fly family.  Once applied, Bti stays suspended in water for 24 to 48 hours, and then biodegrades as it settles to the bottom. The product name of the Bti is VectoBac-GS (EPA Reg.  #73049-10).


For further information contact the East Middlesex Mosquito Control Project at 781-899-5730.