How to Control Invasive Plants

Japanese Knotweed

I was at my local garden center last weekend and noticed a poster listing the invasive plant species of concern here in New Hampshire. Can you tell me where to find more information and how to control these plants? 

Invasive plants compete with and displace our native plant species, potentially leading to loss of habitat for native flora and fauna. In their native habitats, these invasive species generally have natural plant competitors or insect pests that keep their populations in check.

The New Hampshire Department of Agriculture, through the Plant Industry Division, lists 26 invasive upland plant species. These can all be viewed in the New Hampshire Guide to Upland Invasive Species.

Check Your Pool for Asian Longhorned Beetles

Asian longhorned beetle. Photo courtesy of Donald Duerr, USDA Forest Service,

DURHAM, N.H. – UNH Cooperative Extension is asking New Hampshire residents with swimming pools to check their filters regularly for Asian longhorned beetle (ALB). This invasive insect poses a serious threat to New Hampshire’s forests and trees.

While ALB isn't in New Hampshire yet, Karen Bennett, Extension forestry specialist, said, “We need many people looking for it so we can take steps to limit its spread, if it arrives.”

ALB was found in trees in Worcester, Mass. in 2008, but experts estimate it inhabited the trees for about 10 years before they identified the problem. Some Worcester homeowners subsequently reported that they had been collecting ALB in their swimming pools for years prior to the 2008 identification.

Emerald Ash Borer Discovered in Gilmanton

Emerald Ash Borer Discovered in Gilmanton

Quarantine expands; public information meeting July 21 in Laconia

GILMANTON, N.H. – A highly destructive forest pest, the emerald ash borer (EAB), has made its way to Gilmanton. Though it only infests trees in the olive (Oleaceae) family and is highly specific to ash trees, it’s considered the most destructive forest pest in North America. Unless preventative steps are taken, EAB kills infested ash trees within three to five years.

A public meeting about EAB and the quarantine takes place July 21 from 4:00 to 6:00 p.m. in conference room 1 (the multipurpose room) of the Belknap County Complex, 34 County Drive, Laconia. 

Finding Alternative Pest Controls for Grubs

Jeremy Delisle, UNH Cooperative Extension Education Center Program Coordinator

Every year there is a growing interest in controlling Japanese beetle grubs using alternative pest control materials such as microbial-based insecticides and beneficial nematodes.

Japanese beetles were first introduced into this country in the early 20th century. By 1948 one of the first microbial insecticides ever registered in the United States was being used to controlJapanese beetle grubs in turfgrass. That microbial insecticide is milky spore. Milky spore disease (Bacillus popillae) is a bacterium applied to turf grass as a dust. It’s effective only in controlling Japanese beetle grubs. Japanese beetle grubs must ingest the bacteria.

Emerald Ash Borer Awareness Week Runs through May 23

Governor Hassan Declares May 17-23 Emerald Ash Borer Awareness Week

Readers of this pest alert are already aware of emerald ash borer. Thank you for being our eyes along our streets and in our forests. You can help us make others aware by ordering multiple copies of fact sheets and posters for placement at your library, town hall, community center, or for use at community activities such as old home days, or outdoor days. Thank you in advance for any help you can give us.

Governor Hassan Declares May 17 – 23 Emerald Ash Borer Awareness Week

CONCORD, N.H. – New Hampshire Governor Maggie Hassan declared May 17-23 Emerald Ash Borer Awareness Week. The proclamation encourages all citizens, landowners and municipalities to learn more about emerald ash borer and develop and implement emerald ash borer preparedness plans.

The emerald ash borer (Agrilus planipennis) is an invasive beetle that attacks and kills North American species of true ash (Fraxinus spp.) within three to five years of infestation. The insect has been located in 10 towns in New Hampshire since 2013, and three New Hampshire counties (Hillsborough, Merrimack, and Rockingham) are under quarantine for the movement of ash products.

It’s National Invasive Species Awareness Week, February 22-28

National Invasive Species Awareness Week is being celebrated this week, February 22-28, 2015. Invasive species come in many forms—plants, animals, pathogens—and are found in all types of habitats—rivers, lakes, fields, forests, urban environments, yards, oceans, and so on.

UNH Cooperative Extension’s Forestry and Wildlife Program focuses a great deal of time and effort on educating landowners and communities about invasive species, and helping them figure out how to manage invasive species. Emerald ash borer, hemlock woolly adelgid, buckthorn, garlic mustard and burning bush are just some of the invasives that we deal with every day.

Everyone can play a role in managing invasive species. Here are some ways you can help.

A Post-Presentation Press Release Means Even More Promotion!

Kamal Nath (CC2006), a Speaking for Wildlife volunteer in Carroll County, recently presented the new SFW presentation - NHBugs: The Big Three - at the Effingham Public Library. A very engaged audience of 8 individuals attended the presentation, but even more were made aware of these invasive insects and the Speaking for Wildlife program, in general, when Kamal sent a post-presentation press release to be published in the Carroll County Independent. Kamal passed along a copy of his press release, so that we can all get an idea of how to continue to spread the word about Speaking for Wildlife, even after the presentation itself is over. Kamal also noted that newspapers like at least one picture to print along with whatever story and news you're sending their way. Thanks, Kamal!




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