Invasive Plants & Insects

ash tree with blonding from emerald ash borer
5 Resources for Emerald Ash Borer Awareness Week 2025
Keep an eye out for EAB, from May 18—25 and beyond.
Keep an eye out for EAB, from May 18—25 and beyond. Learn More
National Invasive Species Awareness Week logo
5 Ways to Participate in National Invasive Species Awareness Week
Keep an eye out for invasive species, from February 24—28, 2025 and beyond.
National Invasive Species Awareness Week (NISAW) is being celebrated February 24— 28, 2025. Learn More
Glossy buckthorn with berries
Fall is for Invasives Management
Late autumn into early winter is the perfect time to identify and manage invasive plants. They are easier to spot amongst the frost-killed and sleepin... Learn More
Asian longhorned beetle adult, photo by Donald Duerr, USDA Forest Service, Bugwood.org
Survey Your Pool Filters for Asian Longhorned Beetle
Keep an eye out for invasive insects this summer.
Check your pool filters for invasive insects this summer. Learn More
Wanted Garlic Mustard
Wanted: Garlic Mustard
Pull by Hand April-June before it goes to seed
Garlic mustard is a pernicious non-native plant which: 1. Releases sinigrin, preventing the growth of other plants by disrupting a beneficial fung... Learn More
European barberry
The First Signs of Spring: Spotting Invasive Plants
As the weather warms and our days stretch longer and brighter, we begin to see and hear the bustle of the natural world picking up all around us. The ... Learn More
Woman pulling out invasive plants
Dealing with Invasive Species: Pick Your Battles
Japanese Knotweed is filling the roadsides leading up to your house. Garlic mustard has begun along the paths you walk in the forest. Multiflora rose ... Learn More
Intern pulling pepperweed
Nature Groupie Interns Discover and Remove Perennial Pepperweed, an Invasive Species
UNH students gain field experience and help protect the N.H. Seacoast through Extension’s summer internship program
UNH students gain field experience and help protect the N.H. Seacoast through Extension’s summer internship program. Learn More
Glossy buckthorn (Frangula alnus)
Invasive in the Spotlight: Glossy Buckthorn
A canopy invader best controlled with early detection
A canopy invader best controlled with early detection Learn More
european barberry
Invasive in the Spotlight: European Barberry
While not very common in New Hampshire, it is highly invasive and has the potential to become a significant pest
While not very common in New Hampshire, it is highly invasive and has the potential to become a significant pest Learn More