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See also: New Hampshire's Prohibited Invasive Plant Fact Sheets for additional invasive trees, shrubs, vines, and herbaceous plants

As of Jul 2011, New Hampshire has banned the importation of untreated firewood without a commercial or home heating compliance agreement. Firewood is a major source of damaging insects and diseases. This quarantine will help protect the health on New Hampshire's forests.

To address mounting concerns over invasive plants and the role NHDOT activities play in the spread of these plants along roadsides, Best Management Practices (BMPs) have been developed with input from Maintenance Districts, the Roadside Development Section, the Bureau of Construction, and the NH Department of Agriculture. Implementation of these BMPs will help prevent the spread of invasive plants caused by maintenance and construction activities.

Grant funds are available for the control, prevention and research of state-listed aquatic invasive plants. Grants are available to local lake associations and municipalities for control and/or prevention of state-listed exotic aquatic plants, and to institutions of higher learning for in furthering research associated with exotic aquatic plant management, control, biology, ecology or prevention.

See also: Invasive Plants for more resources

See also: Invasive Plants for more resources

This summer, state biologists from the New Hampshire Department of Environmental Services (NHDES) documented the presence of a new aquatic invasive species to New Hampshire. The spiny water flea (Bythotrephes longimanus) was documented on September 13 in the deepest location of Lake Winnipesaukee, in the Broads in Gilford, New Hampshire. Subsequent sampling also confirmed spiny water flea presence in Alton and Wolfeboro areas of the lake. State biologists believe this is a recent infestation.

Please use this form to report any suspected invasive insect, forest pest, or disease in New Hampshire. NHBugs is a reporting tool for invasive insects and diseases detected within New Hampshire. If you are located outside of New Hampshire, please contact your state agency of agriculture to determine how to make a report in your state.

The Asian Longhorned Beetle (ALB) was found in Worcester, MA in August 2008 and in Boston in July 2010. This insect pest poses a serious risk to trees and forests. ALB has not yet been found in New Hampshire. Help us by looking at the debris from your swimming pools. Whenever you clean your pool, look at the debris you collect in your filter and skimmers. Use this fact sheet [PDF, 1.22 MB] to compare collected insects to common insects. Upload pictures of any insect you think is a longhorned beetle.