An Incisive Invader

Corydalis incisa

Contact: Damien Ossi | Flowers and foliage of Corydalis incisa Gary Fleming, Virginia Department of Natural Resources, Bugwood.orgANNAPOLIS, MD (May 01, 2017) – Incised fumewort (Corydalis incisa), also known as purple keman, is a biennial, shade-tolerant forb in the poppy family, related to bleeding-hearts and to the showy garden perennial spring fumewort. It is native […]

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Choose Your Viburnums with Care

Doublefile viburnum

Contact: Sylvan Kaufman | Doublefile viburnum (Viburnum plicatum tomentosum) Richard Webb, Bugwood.orgANNAPOLIS, MD (April 01, 2017) – Gardeners love viburnums for their white spring flowers, compact growth, and colorful fall fruits and foliage. Few gardeners know that some viburnums have become invasive plants and should be avoided. Linden viburnum (Viburnum dilatatum), doublefile viburnum or Japanese […]

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Sudden Oak Death Could Be Back in Maryland, and You May Have It.


Contact: Ramesh R Pokharel, Plant Pathologist, Maryland Department of Agriculture| Leaf spot and blight in Rhododendron caused by P. ramorum. Leaf blight leading to dieback in Kalmia ‘Olympic Wedding.’ANNAPOLIS, MD (January 05, 2017) – Sudden oak death, a relatively new disease, caused by the pathogen Phytophthora ramorum, was found for the first time in 1995, infecting oaks in California. The […]

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Invasive Species: They’ve Got “Good Genes”

Callery Pear Field

Contact: Matt Salo, Naturalist, Town of CheverlyKerrie L. Kyde, Maryland DNR Callery Pear (Pyrus calleryana) invasion of an open field in Maryland. Photo: K. KydeANNAPOLIS, MD (December 01, 2016) – Invasive plants cost the U.S. economy billions of dollars each year due to losses they incur in agriculture, forestry, fisheries and the recreation industry, plus […]

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Barriers to BSal: Averting the Apocalypse for North American Salamanders

Red-Spotted Newt

Contact: Scott Smith | Red-Spotted Newt (Notophthalmus v. viridescens). Photo: John White.ANNAPOLIS, MD (November 01, 2016) – Chytrid fungus (Batrachochytrium dendrobatidis or Bd), has been called the greatest threat to global amphibian biodiversity, having caused the disappearance of more than 200 of the world’s frog species since the 1970s. Now there’s a frightening “new kid on the […]

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King of the (Aquatic) Beasts? Lionfish in North America

Lion Fish

Contact: Jonathan McKnight | Photo courtesy of Don DeMaria, USGSANNAPOLIS, MD (October 01, 2016) – Lionfish have a lot going for them. They are a spectacular little fish, highly variable in coloration and carrying a halo of ornate fin spines that appear both delicate and menacing. Their spines can deliver a powerful toxic assault on […]

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The “nom de plume” of plume grass is: EMERGING INVADER


Contact: John Peter Thompson | ORKerrie Kyde | Photo: The Nature Conservancy , The Nature Conservancy, Bugwood.orgANNAPOLIS, MD (September 01, 2016) – Plume grass, or Ravennagrass (Saccharum ravennae, and many synonyms) is a botanical cousin to sugar cane. But its escape from ornamental plantings to naturalized patches is not so sweet. Reported as escaped in natural […]

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Ailanthus’ Achilles Heel: A Poisoned Arrow in a Wilt Fungus


Contact: Aaron Cook | Healthy Ailanthus altissima, producing prolific seeds and samaras which can be seen much of the year. Photos: Leslie J. Mehrhoff, University of Connecticut,, MD (August 01, 2016) – Tree-of-heaven (Ailanthus altissima), also known as ailanthus, shumac, stinking sumac, stink-tree, copal tree, or Chinese sumac, is a common alien weed in […]

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Should Bee-Bee Tree be Avoided?

Bee bee tree branches

Contact: Sylvan Kaufman | Photos: Pat Breen, Oregon State University.ANNAPOLIS, MD (July 01, 2016) – One way to prevent new plant invasions is to be on the lookout for species that seem to be spreading into natural areas a little too aggressively. Which plants will be the next tree of heaven, running bamboo, or kudzu? […]

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Boaters Beware!

Clean your gear

Contact: Jay Kilian, Maryland Department of Natural Resources, Resource Assessment Service | Invasive aquatic plants such as Hydrilla can easily become entangled in boat props and trailers. If not removed by informed boaters, these plants and other hitchhikers can be moved and introduced into new waters. Photo: Emily Johnstone, Ontario Federation.ANNAPOLIS, MD (June 01, 2016) […]

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