Mosquito control operations to begin Monday, April 16th

April 16, 2018

Mosquito control activities will begin in Portsmouth on Monday, April 16th. These operations, starting with the control of larval mosquitoes in stagnant bodies of water, will be conducted by Municipal Pest Management Services, Inc.  

The primary method of control will be a bacterium (BTI) that is a naturally occurring parasite of mosquito larvae. Areas requiring control will be salt marshes, cattail marshes, red maple swamps, woodland pools, roadside ditches, street and parking lot catch basins, marshes, flooded fields and stormwater basins. Special emphasis will be placed upon the control of mosquito species that are known vectors of West Nile Virus and Eastern Equine Encephalitis.

Street spraying typically starts in early June and continues, as necessary, until early September. The insecticide to be used in street spraying is sumithrin (Anvil 2+2 ULV). Trapped mosquitoes will be identified to species and delivered to Concord for testing (West Nile Virus and Eastern Equine Encephalitis).             

Due to concerns associated with chemical compounds and their long-term effects on our environment and the community, the City does not use Roundup or Glyphosate products for its roadside weed control program. Last year the City conducted an extensive pilot study to evaluate viable organic products for the next fiscal year, testing seven organic products to determine effectiveness, dosage, and frequency of application to better identify the costs and the best organic product to use.                                                                                                                                                      

As an eco-municipality, the City is committed to not using synthetic toxic pesticides in public places and this introduction of a broader organic weed control program. For more information about mosquito control, please click here.