NORTH READING — The East Middlesex Mosquito Control Project will be conducting a helicopter application of the biological larvicide Bti (Bacillus thuringiensis var. israelensis) to control mosquito larvae. Wetlands currently being evaluated for this application in North Reading are located at or near the following locations: Batchelder Ave., Chestnut St., Crestwood Rd., Elma Rd., Equestrian…