Polaroid picture of spotted lanternfly nymphs on a branch. The lanternfly are bright pinkish red with white and black spots and black legs.
Spotted Lanternfly

Other names: Spotted lanternfly, Lycorma delicatula Plants susceptible: Over 70 species but especially black walnuts, hops, grapes, roses, tree of heaven, read maple, river birch, and fruit trees. Where did it come from? It was first introduced on imported stone from south eastern Asia and was found in Pennsylvania in 2014. It is not currently […]

A sloping hill with a fence at the bottom and a parked silver car. There appear to be trees on the slope. The entire slope, trees, and fence are covered with bright green vines.

Other names: Kudzu, Pueraria montana Where did it come from? Kudzu was introduced into gardens in the early 1900s and was later used for forage. Why is it invasive? It grows quickly over other small plants, trees, and on to structures like telephone poles. It can girdle trees and shades out native plants below it. […]

A redish brown injury on the bark of a brown tree with a small amount of green moss on it.
Sudden Oak Death

Other names: Sudden oak death, ramorum leaf blight – foliar/twig disease, ramorum dieback, phytophthora canker disease, Phytophthora ramorum Plants susceptible: Oaks, rhodedendroms, horse chestnut, laurel. For full list see: Host plant list Where did it come from? Sudden oak was first detected in San Francisco in the mid-90s. It can be spread through infected plants […]

Close view of a cluster of white flowers with pink centers.
Callery/Bradford Pear

Other names: Callery, bradford, aristocrat, autumn blaze, Cleveland select, whitehouse, ornamental pear and many others, Pyrus calleryana Where did it come from? It was imported in the early 1900s to be used as an ornamental tree. Why is it invasive? Callery pear may look pretty, but it’s crowding out Indiana native trees! It’s the first […]

Several bushes in a field near the edge of a wooded area. The bushes are mostly brown and still have dead leaves on them. There are small patches of green leaves.
Boxwood Blight

Other names: Boxwood blight, Calonectria pseudonavitulata (Prev: Cylindrocladium pseudonaviculatum, Cylindrocladium buxicola) Where did it come from? Boxwood blight was first discovered on the east coast in 2011. It overwinters in lead litter and on infected plants and can be spread by moving infected material. Why is it invasive? It causes dark leaf spots, white sporulation […]

Mile a minute vine in a forested area. The vines cover everything that is not on the forest floor. The vines have dense arrow shaped leaves.
Mile-A-Minute Vine

Other names: Mile-a-minute-vine/weed, Asiatic tearthumb, Persicaria perfoliata Where did it come from? This plant was introduced from Asia in the 1930s in contaminated ornamental plant soil. Why is it invasive? It grows quickly (as the name suggests!) and forms thick blankets that crowd out native species. How do you prevent its spread? Remove it from […]

The image shows a field of identical plants. The plants have green arrow shaped leaves with sharp points along the edges. The plants have small clusters of white flowers. There are branches with no leaves above the plants.
Garlic Mustard

Other names: Garlic Mustard, Hedge Garlic, Sauce-Alone, Jack-by-the-Hedge, Poor Man’s Mustard, Jack-in-the-Bush, Garlic Root, Garlic Wort, Mustard Root, Alliaria petiolata Where did it come from? Garlic mustard was brought from Europe in the mid-1800s to be cultivated for food and medicine. Why is it invasive? Garlic mustard can take over the forest under story displacing […]

A polaroid style photo of an Asian longhorned beetle. The beetle rests in a human hand. It has a penny next to it. The beetle is about the size of two pennies. The beetle is black with white spots and has antenna longer than its body.
Asian Longhorned Beetle

Other names: Asian longhorned beetle, starry night beetle, Anoplophora glabripennis Plants susceptible: all maples (esp. sugar maple), horse chestnut, birch, willow, elm, + many more species Where did it come from? Asian longhorned beetle has been repeatedly introduced from its native range in China. Why is it invasive? Asian longhorned beetle kills the trees it […]

A close up of plants with small, rounded bright green leaves. The plant has white flowers clustered throughout. The flowers have long thin tubes made of the petals at the base. The petals have two clumps at the top and one long petal at the bottom.
Invasive Honeysuckles

Other names: Japanese Honeysuckle, Chinese Honeysuckle, Hall’s Honeysuckle, Family: Caprifoliaceae, Lonicera japonica (Japanese honeysuckle) Where did it come from? Invasive honeysuckles were initially introduced in the late 1800s as ornamental plants. Later they were used for erosion control and wildlife cover. Why is it invasive? Invasive honeysuckle vines grow rapidly and cover large areas. They […]

The surface of the water. Just below the surface of the water is filled with long green plants about the thickness of a cat tail.
Brazilian Elodea

Other names: Brazilian Elodea, Brazilian Waterweed, Anacharis, Egeria densa Where did it come from? This plant was introduced from South America in 1893 into Long Island. It was sold as an aquarium plant to oxygenate aquariums and was able to escape because old aquarium water was dumped into water ways. Why is it invasive? Brazilian […]

A Japanese beetle resting on a green leaf. The beetle is copper colored with black legs, white tufts on the edge of its body, with a green metallic head.
Japanese Beetle

Other names: Japanese Beetle, Popillia japonica Where did it come from? Japanese beetle was introduced in 1916 from Japan. It was first recorded in New Jersey and it’s speculated that it was transported in the soil of an ornamental plant. Why is it invasive? Japanese beetle is an extreme generalist that eats over 300 types […]

A row of planted burning bushes next to a road. The bushes have bright red leaves.
Burning Bush

Other names: Burning bush, winged euonymus, winged spindletree, winged wahoo, Euonymus alatus Where did it come from? Introduced as ornamental in 1860s from western Asia and found to be invading natural areas in 1960 – 1970s. Why is it invasive? Tolerant of full shade, can grow in dense thickets, and displace native plants. How do […]

A Polaroid style image of a jumping Asian carp. The fish is silver.
Asian Carp

Other names: Asian carp refers to multiple species: bighead carp (Hypophthalmichthys nobilis), silver carp (Hypophthalmichthys molitrix), grass carp (Ctenopharyngodon idella), and black carp (Mylopharyngodon piceus) Where did it come from? All four of these fish were introduced from Asian in the 1970s to control weed growth in both aquaculture and canals. Why is it invasive? […]

Gypsy Moth

Other names: Gypsy moth, Lymantria dispar Where did it come from? Gypsy moth was imported from Europe in 1869 by a man hoping to cross them with silk moths. What do they eat? Gypsy moth caterpillars primarily feed on oak but will move to other host plants if it runs out of oak leaves. Why […]

Close up of several maple leaves. The leaves closest to the front of the image are attaches to a thin brown stem. The leaves have red stems and veins. The tissue of the leaves is yellow with brown and green spots. The tissue has holes in it.
Norway Maple

Other names: Norway maple, Acer platanoides Where did it come from? Norway maple was imported from Europe and Asia in 1756 to be used as an ornamental tree. Why is it invasive? Norway maple out-competes many trees including the ecologically and economically important sugar maple. It forms a thick canopy that shades out the under […]

The image shows a vine twined together. The vines have long arrow shaped leaves growing out of it. The vine has clusters of flowers. The flowers have thick purple petals that look textured. They have a green center.
Black and Pale Swallow-wort

Other names: Black swallow-wort (Cynanchum louiseae), pale swallow-wort (Cynanchum rossicum), dog strangler vine Where did it come from? It was imported from Europe in the late 1800s to be used in botanical gardens in Massachusetts. Why is it invasive? It covers the areas that it grows in and out competes most other plants. Animals that […]

A mute swam swimming on a lake. The swan is white. Its beak is bright orange and is outlined in black. A patch of the black outline connects to the bird's black eyes.
Mute Swan

Other names: Mute swan, Cygnus olor Where did it come from? Mute swans are native to Europe and were brought to North America to decorate urban parks. Why is it invasive? These birds are highly aggressive and will chase both humans and native birds. In addition, they out compete native birds for food resources with their […]

A close image of a tree of heaven plant. It shows the leaves and seeds. The leaves are long, slim, and come to a point. The leaflets are attached opposite each other to the main stem. The seeds are also long and thing but are curled and twisted at the edges. They are pink and green.
Tree of Heaven

Other names: Tree of heaven, Chinese sumac, varnish tree, Ailanthus altissima Where did it come from? Tree of heaven was introduced multiple times from China in the late 1800s. It was planted both as a strictly ornamental tree and for medical use. Why is it invasive? Tree of heaven has a strong unpleasant smell and […]

The edge of a forested area. There is a man with a red spraying device that he is using to spray some of the edge plants. One of the plants is taller than the man. It has large leaves and flowers larger than his head. The flowers are made of smaller individual flower clusters much like queen Ann's lace.
Giant Hogweed

Other names: Giant Hogweed, Giant Cow Parsley (Not Cow Parsnip), Cartweel-Flower, Heracleum mantegazzianum Where did it come from? These plants were brought from Caucasus Mountain region in the early 1900s to be used as a garden plant in New York. Why is it invasive? Even minor contact with this plant can cause SEVERE BURNS. Sap from […]

Two leaves are in the center of the image. The leaves are light bright green. They have a similar shape as maple leaves. In the background are more of the same leaves as well as a few other plants.
Japanese Hops

Other names: Japanese Hops, Humulus japonicus Where did it come from? Japanese hops was introduced from east Asia in the late 1800s. It was imported to be used as an ornamental plant. Why is it invasive? The hairs on the stem can irritate skin and the pollen can cause allergic reactions. Japanese hops out competes […]

A close up of a thistle plant. The thistle has sharp spikes of green leaves. The flower is a light purple tuft.
Invasive Thistles

Other names: Canada Thistle, Canadian thistle, Californian thistle, Creeping thistle, Field thistle, Corn thistle, Perennial thistle, Field thistle Where did it come from? Most invasive thistles came from Europe in the 1600s. The exact means of introduction are largely unknown, but it is speculated that they were brought over in farm seeds. Why is it […]

There is a larger image and three smaller images in the top left hand corner. The larger image shows a dense patch of small green plants. One of the plants has thorns and red berries. The first of the smaller images shows brnaching green stems with red berries on top from the side. The second image shows the same type of branching green stem with red berries that have small black circles on top. The final image shows leaves of the plant. The leaves are ovals with points on either end. They are attached opposite to each other on the plant with one single leaf at the end.
Multiflora Rose

Other names: Multiflora rose, baby rose, Japanese rose, seven-sisters rose, rambler rose, wild rose, multiflowered rose, Rosa multiflora Where did it come from? Multiflora rose was imported from Eastern Asia in the late 1700s as an ornamental, in erosion control, and as a living fence. Why is it invasive? This bush forms dense strands that […]

Bittersweet in winter. the bittersweet branches do not have leaves but still retain their bright red berries with yellow coverings.
Oriental Bittersweet

Other names: Chinese, Asiatic, or Asian bittersweet, round-leaved bittersweet, Celastrus orbiculatus Where did it come from? Oriental bittersweet was introduced in the late 1800s as an ornamental plant. It was spread by both people who favored it for holiday decorations and animals who eat the berries. Why is it invasive? Bitter sweet vines rapidly spread and can […]

A dense mat near the surface of the water of a long thing plant with small leaves attached to a thin stem.

Other names: Hydrilla, Florida elodea, water thyme, Indian star-vine, Hydrilla verticillata Where did it come from? Hydrilla was introduced from the Eastern Hemisphere in the 1960s. It was brought into Florida for use in the aquarium trade. Why is it invasive? Large mats of hydrilla out compete native plants, tangle propellers, slow hydroelectric power production, […]

A red poll holding up a large amount of messy curly water plants. There is a pond behind the plants. The pond is also full of the curly green plant.
Curly-Leaf Pondweed

Other names: Curly pondweed, curly-leaf pondweed, Potamogeton crispus Where did it come from? Curly -leaf pondweed was introduced in the mid-1800s and was likely introduced from Asia with common carp. Why is it invasive? Forms dense mats that inhibit native plant growth, impedes flow of water in irrigation channels, depletes water nutrients in fisheries, and […]

Eurasian water milfoil in a pond. The water in the pond is bright blue. The water milfoil is green and forms dense mats that float near the surface of the pond. The mats fill most of the water shown in the image.
Eurasian Watermilfoil

Other names: Eurasian watermilfoil, spiked watermilfoil, Myriophyllum spicatum Where did it come from? Eurasian watermilfoil was introduced into the United States between 1880-1940 from its native range in Europe, Asia, and North Africa. Why is it invasive? Eurasian watermilfoil out competes native species but is not good food or habitat for native animals. It makes […]

Brown marmorated stink bug feeding on a red pepper plant.
Brown Marmorated Stink Bug

Other names: Brown marmorated stink bug, Halyomorpha halys Plants susceptible: Generalists that frequently attack fruit and vegetable crops. Where did it come from? Brown marmorated stink bug was introduced from East Asia and was first collected in 1996 in Allentown, PA. It is uncertain how it was introduced, but most think it was brought over […]

A Polaroid style photo of an emerald ash borer. The emerald ash borer stands on brown bark. The ash borer is bright green and metallic.
Emerald Ash Borer

Other names: Emerald ash borer, Agrilus planipennis Where did it come from? Emerald ash borer was accidentally introduced into Michigan from Asia probably in shipping pallets. It has now spread throughout the United States and some parts of Canada. Why is it invasive? The emerald ash borer feeds on, yep, you guessed it, ash trees. Their larvae […]

A Polaroid style photo of a feral hog. The hog is standing in a field. The hog is brown with coarse hair.
Feral Hogs

Other names: Feral hog, feral swine, wild boar, wild pigs, Sus scrofa Where did it come from? Feral hogs are a mix of escaped domestic pigs and wild boars imported from Europe for hunting. Why is it invasive? Feral hogs pose significant threats to agriculture and the environment, as their rooting damages crops, parks, and […]

Bright green corn leaf with scattered patches of yellowing. There are dark brown-red spots along the central vein.
Tar Spot

Other names: Tar Spot of Corn, Phyllacohra maydis Where did it come from? Tar spot is a pathogen from Central and South America that was first found in North America in 2015 in Indiana and Illinois. Why is it invasive? It produces small raised black spots in leaves and can cause yield loss. Resources: ♦ […]

Narrow tunnels and small holes in a cross section of wood.
Thousand Cankers Disease

Other names: Thousand Cankers Disease (Walnut twig beetle, Pityophthorus juglandis + Geosmithia morbida) Plants susceptible: Walnut, Butternut What is it? Thousand cankers disease is caused by an interaction between a beetle and a fungus. The disease occurs when walnut twig beetles attack a tree and carry a fungus, Geosmithia morbida, with them. If either the beetle […]