INVASIVE SPECIES OF DELAWARE

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Presentation transcript:

INVASIVE SPECIES OF DELAWARE Kerry Britton, USDA Forest Service, www.invasive.org Yikes! They’re everywhere!

Introduced Species Non-native species (alien, exotic) Some can become invasive, spreading throughout their new area. Are difficult to control

Why did we bring them?

For food…

‘cuz they’re purdy… Gregg Hill Gardens

for medicine… Chamomile (Matricaria recutita)

or some other use. Fiber Erosion control Conservation projects Daniel Barringer/Natural Lands Trust Crownvetch (Coronilla varia) Fiber Erosion control Conservation projects Multiflora Rose (Rosa multiflora) James H. Miller, USDA Forest Service, www.forestryimages.org USDA-APHIS PPQ Archives, www.forestryimages.org Gypsy moth (Lymantria dispar)

Or just by accident! Zebra Mussels introduced from ballast water

Invasive species… Can grow in many conditions Grow, mature and reproduce quickly Can survive and reproduce in harsh conditions Have roots and rhizomes that store large amounts of food Lack natural predators, parasites and diseases

Kudzu, or Mile-a-Minute Was introduced in 1876 from Japan at the Centennial Exposition in Philadelphia to celebrate different cultures Gardeners grew it for ornamental purposes Was used for erosion control Now used to feed goats and to make baskets Yun Wu, USDA Forest Service, www.invasive.org Kerry Britton, USDA Forest Service, www.invasive.org

Purple Loosestrife Brought from Europe to plant in gardens USDA Brought from Europe to plant in gardens Competes with wetland plants John M. Randall/The Nature Conservancy

Multiflora Rose Brought here from Asia in the 1800s Was used as a living fence and for erosion control James H. Miller, USDA Forest Service, www.forestimages.org James H. Miller, USDA Forest Service, www.forestryimages.org

Tree of Heaven Lisa L. Smith Lisa L. Smith

Garlic Mustard…yum! Victoria Nuzzo, Natural Area Consultants, www.invasive.org Tennessee - EPPC

Oriental Bittersweet USDI - National Park Service Daniel Barringer/Natural Lands Trust

Japanese Stiltgrass Barry A. Rice/The Nature Conservancy John M. Randall/The Nature Conservancy

Nutria Don’t let this cute little guy fool you! Introduced for the fur trade Damages vegetation and destroys wetland habitats

The plant Mrs. Nowak hates more than any other…Phragmites!!! John M. Randall/The Nature Conservancy

Also known as the common reed James R. Allison, GA Dept. of Natural Resources, www.invasive.org James H. Miller, USDA Forest Service, www.forestryimages.org

Problems with Invasive Species Change the food web Reduce biodiversity Degrade habitats Transmit exotic diseases and parasites Cost to economy