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Larvicide to be applied over salt marshes

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The Northeast Massachusetts Mosquito Control and Wetlands Management District is again scheduled to apply larvicide using helicopters over coastal salt marshes this week. Similar applications were conducted in June and last September. The areas to be sprayed include Newbury, Ipswich, Rowley, Salisbury, and Newburyport, and the larvicide to be applied is Bacillus thuringiensis israelensis (also called bti), a natural bacterium found in soil and water that is nontoxic to people, fish, birds, bees, and most insect species other than mosquito larvae and related insects in the fly family. It is to be applied by helicopters flying low over the marshes, and residential areas are not expected to be affected, according to a statement from the town.

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