Invaders of the Month

Thumbnail Title Topic Scientific name Month
palmer adult scaled Palmer Amaranth: The Most Obnoxious Noxious Weed in Maryland Palmer amaranth Amaranthus palmeri July 2024
picture3nymphs Watch out for Creepers on your Crapemyrtle! Crapemyrtle bark scale, Crapemyrtle Acanthococcus lagerstroemiae, Lagerstroemia indica March 2023
Map We are legion, we are lanternfly Spotted Lanternfly Lycorma delicatula January 2023
MISCIOTMHemlock Eat Your Carrots, Just Not This One July 2022
1 Persicaria filiformis Flowering IOTM 20200913 175746 Don’t Jump to Conclusions about Asian Jumpseed July 2022
20210511 103220 2 scaled Unravelling Maryland’s Knotweed Problem, One Psyllid at a Time Knotweed psyllid Aphalara itadori September 2021
image 2 Take the Bait…don’t dump it! June 2021
9026732596 42c8ac234a z Colossal Catfish Cause Conservation Complications Blue and Flathead Catfish Ictalurus furcatus and Pylodictis olivaris May 2020
5455736 PPT Deceptive little buttercup is foe, not friend Lesser Celandine Ficaria verna March 2020
beech leaf disease banding Murray Moreland 6 26 17 “New Leaf Disease is a Beech” Beech Leaf Disease Litylenchus nematodes February 2020
image The visible invisible: impacts of invasive jumping worms Jumping worms Various spp. November 2019
5477679 SMPT The Sign of the Times are the Vines Vines Various spp. October 2019
Walnut Twig Beetle Thousand Cankers Disease Reappears in Maryland Thousand Cankers Disease and Walnut twig beetle Geosmithia morbida and Pityophthorus juglandis August 2019
Trapa sp Teaming up to Tackle Two-horned Trapa: A Highly Invasive New Species of Water Chestnut New Water Chestnut Trapa bispinosa July 2019
5393646 SMPT Pray for the prey of the praying mantis Exotic mantis species Various spp. June 2019
WeedRisk Toil and Trouble: Weed Risk Assessment Weed Risk Assessment Various spp. April 2019
5315017 SMPT Tiny beetle, giant impact. Khapra beetle Trogoderma granarium March 2019
5556633 SMPT Invasive Vinca, Rhymes with “Stinka” Common periwinkle and bigleaf periwinkle Vinca minor and Vinca major January 2019
5431756 PPT ‘Tis the Season to Fear Holly Non-native Invasive Hollies Ilex spp. December 2018
business cargo cargo container 1117210 Safeguarding American Agriculture – One State at a Time USDA Plant Protection and Quarantine (PPQ) Various spp. November 2018
image Spotted Lanternfly and Tree of Heaven Spotted Lanternfly and Tree of Heaven Lycorma delicatula and Ailanthus altissima September 2018
2307060 PPT Nitrogen Fixer Fixin’ For Trouble Autumn Olive Elaeagnus umbellata August 2018
image 1 Stop the Hitchhikers: Clean Your Gear Clean your Gear Various spp. July 2018
Trapa sp Trapped Again? A New Species of Water Chestnut Discovered in the Potomac New Water Chestnut Trapa sp. June 2018
Amur Honeysuckle Dog Are invasive plants “bugging” you? Japanese barberry and bush honeysuckle Berberis thumbergii and Lonicera maackii May 2018
5398232 PPT The cherry blossoms have arrived! Some good, some bad. Cherries Prunus spp. April 2018
8716636765 1dcd2d610c k This little piggy went to Maryland? Feral swine, wild boar Sus scrofa March 2018
3D4FCF1A BF58 427E 962F 69A75F5A7A26 Not so Heavenly Heavenly bamboo, sacred bamboo, nandina Nandina domestica February 2018
5524069 PPT e1519578290676 Red Alert: Spotted lanternfly Spotted lanternfly Lycorma delicatula January 2018
Agrilus smaragdifrons Good for what “Ails” you? A gift from Heaven? Agrilus smaragdifrons Agrilus smaragdifrons December 2017
miscanthus1 Misgivings over Miscanthus Chinese silver grass Miscanthus sinensis November 2017
495before e1520182335659 Where Have all the “Flowers” Gone? Invasive & Noxious Weeds along Maryland's Interstate Highways Various spp. October 2017
smallcarpetgrass2 A Wavyleaf Wannabe Small carpetgrass Arthraxon hispidus September 2017
AsiaticOakWeevil Maryland Oaks Would Rather “See No Weevil” Asiatic oak weevil Cyrtepistomus castaneus August 2017
MAEDN Not a Professional Scientist? You Can Contribute Regardless! Citizen science Various spp. July 2017
iris pseudacorus e1519715987356 No Pot of Gold at the End of THIS Rainbow! Yellow flag iris Iris pseudacorus June 2017
corydalis incisa An Incisive Invader Incised fumewort Corydalis incisa May 2017
doublefile viburnum Choose Your Viburnums with Care Exotic Viburnums Viburnum spp. April 2017
sudden oak death Sudden Oak Death Could Be Back in Maryland, and You May Have It. Sudden Oak Death Phytophthora spp. January 2017
callery pear field Invasive Species: They’ve Got “Good Genes” Genetics Various spp. December 2016
red spotted newt Barriers to BSal: Averting the Apocalypse for North American Salamanders BSal Batrachochytrium salamandrivorans November 2016
lion fish King of the (Aquatic) Beasts? Lionfish in North America Lionfish Pterois spp. October 2016
5392873 PPT The “nom de plume” of plume grass is: EMERGING INVADER Saccharum ravennae Plume grass / Ravennagrass September 2016
ailanthus1 Ailanthus’ Achilles Heel: A Poisoned Arrow in a Wilt Fungus Ailanthus wilt Verticillium spp. August 2016
Beebeetreebranches Should Bee-Bee Tree be Avoided? Bee-Bee Tree Tetradium daniellii July 2016
cleanyourgear1 Boaters Beware! Clean your Gear Various spp. June 2016
slanternfly adult Shining a Spotlight on Spotted Lanternfly Spotted Lanternfly Lycorma delicatula May 2016
eab The Gift That Keeps on Giving Emerald Ash Borer Agrilus planipennis April 2016
wisteria leaves Wisteria: Criteria for Deliria?! Exotic Wisterias Wisteria sinensis and Wisteria floribunda March 2016
gypsy moth1 “I’m Back!” Gypsy moth Lymantria dispar February 2016
Aldrovanda1 The Waterwheel… Turning Over North American Wetlands Waterwheel plant Aldrovanda vesiculosa January 2016
1412341820726 Preventing Invaders Preventing Invaders Various spp. December 2015
5469663 PPT Lords and Ladies Misbehaving Italian arum Arum italicum November 2015
PB5389509 PPT 300x201 Porcelainberry Porcelainberry Ampelopsis brevipedunculata October 2015
common earthworm1 Exotic Earthworms Exotic Earthworms Various spp. April 2015
Weed Warriors3 Weed Warriors Weed Warriors Various spp. March 2015
Little Brown Bat White Nose Syndrome White Nose Syndrome Pseudogymnoascus destructans* February 2015
Zebra Mussel1 Zebra Mussels Zebra Mussels Dreissena polymorpha January 2015
TCD 2 Thousand Cankers Disease Thousand Cankers Disease Geosmithia morbida December 2014
bushkiller flowers Bushkiller Bushkiller Cayratia japonica September 2014
stiltgrass Biocontrols for Invasive Plants Biocontrols for Invasive Plants Various spp. January 2014
spotted wing 1 Spotting the Spotted-Wing Drosophila Spotted-Wing Drosophila Drosophila suzukii October 2013
zebra mussel hand Zebra Mussel Zebra Mussels Dreissena polymorpha April 2013
Cernuella cisalpina www jaxshell org 20bbj4 Exotic Snails Exotic Snails Various spp. March 2013
cwd map 0 Chronic Wasting Disease Chronic Wasting Disease Transmissible spongiform encephalopathy (TSE) January 2013
so leopard Classroom Pets and Projects Classroom Pets Various spp. September 2012
mam1 Biological Control Agent for Mile-a-Minute Weed Mile-a-Minute Weevil Rhinoncomimus latipes August 2012
waders3 Clean Your Gear Aquatic hitchhikers Various spp. July 2012
bwb1 Boxwood Blight Boxwood Blight Cylindrocladium pseudonaviculatum June 2012
bugs window 5407750 Kudzu Bug Kudzu Bug Megacopta cribraria May 2012
5510127 PPT Lesser Celandine Lesser Celandine or Fig Buttercup Ficaria verna April 2012
weed wrench Types of Weed Control Types of Weed Control Various spp. March 2012
ARAELA PB2 An Unreasonable Facsimile Japanese Angelica Tree Aralia elata January 2012
murdannia1 Murdannia is Murder Marsh dayflower Murdannia keisak October 2011
kalpic31 uconn plant database Castor Oil for What Ails You? Castor Aralia Kalopanax septemlobus September 2011
oak wilt mn 1 Where There’s a Wilt, There’s a Way Oak Wilt Ceratocystis fagacerum August 2011
rrd1 Welcome Biological Control or Dreaded Plant Pest? Rose Rosette Disease Emaravirus sp. July 2011
beefsteak plant 1 You Don’t Want a Stake in This! Beefsteak Plant Perilla frutescens June 2011
VHSFishKill forMISC Save Your Bait, and Keep the Fishing Great Live Bait Various spp. April 2011
goat A Weapon Against Weeds Goats Capra hircus March 2011
golden bamboo reaves 2 Have you been Bamboo-zled? Exotic Bamboos Various spp. January 2011
paper mulberry1 If You Have Allergies, Please Don’t Print This! Paper Mulberry Broussonetia papyrifera December 2010
psb adult An Unwanted Pine Pest Revisited Tomicus piniperda Pine Shoot Beetle November 2010
wintermoth “Winter? Moth” Winter Moth Operophtera brumata October 2010
cogon md “Curse You, Red Baron!” Cogongrass Imperata cylindrica September 2010
tfo No Comparison Between Apples and … Trifoliate Orange Poncirus trifoliata August 2010
llmahonia It is Not Holly Leatherleaf Mahonia Mahonia bealei July 2010
akebia1 Chocolate Vine: Not So Sweet Fiveleaf akebia Akebia quinata June 2010
feral cat Feral Cats Felis catus Feral Cats April 2010
image Despite the Lycopene, Still a Bad Actor Autumn Olive Elaeagnus umbellata March 2010
n maple foliage A Familiar and Easily Overlooked Intruder Norway Maple Acer platanoides January 2010
feralhog Coming Soon to an Ecosystem Near You? Feral Hogs Sus scrofa December 2009
burmese python Could Your Pet Be an Invasive Species? Pets Various spp. November 2009
5021038 PPT Dem “Yellows” Give Me the Blues Elm Yellows Phytoplasma spp. October 2009
5205097 PPT Tied in Knots by Knotweed Japanese knotweed Fallopia japonica September 2009
Pale swallow wort in bloom Beware: The Dog-Strangling Vines! Black and pale swallow-worts Vincetoxicum nigrum and Vincetoxicum rossicum August 2009
1262001 PPT What’s Black and White, and Dread All Over? Asian Longhorned Beetle Anoplophora glabripennis July 2009
hydrilla naylor There’s No Hiding from Hydrilla Hydrilla Hydrilla verticillata June 2009
mimosa flower kyde “But It’s So Beautiful!” Mimosa Albizia julibrissin May 2009
nutria Restoration through Eradication: Neutralizing Nutria in the Chesapeake Bay Nutria Myocastor coypus April 2009
grass carp Grass Carp in the Chesapeake Bay: A Watery Gypsy Moth? Grass Carp Ctenopharyngodon idella March 2009
bucket bait A Bucket-o-Trouble! Bait bucket introductions Various spp. February 2009
firewood Buy It Where You Burn It Firewood Various spp. January 2009
5019031 PPT Bark Disease Blitzes Beech Beech Bark Disease Complex Neonectria faginata and Neonectria ditissima December 2008
wingedBurningBush2 Not so Anonymous Euonymus Winged Burning Bush Euonymus alatus November 2008
1113007 PPT Brown Marmorated Stink Bug Revisited Brown Marmorated Stink Bug Halyomorpha halys October 2008
kudzu griesser 3 Savior to Scourge in Only 7 Inches a Day Kudzu Pueraria montana var. lobata August 2008
conium flwrs klk Use the Wisdom of Socrates to Identify the “Blood of Socrates” Poison hemlock Conium maculatum July 2008
5550936 PPT The Moth that Eats a Million Acres Gypsy Moth Lymantria dispar June 2008
didymo 300 Oh No! Not Rock Snot! What Do You Know About Didymo? Didymo or rock snot Didymosphenia geminata May 2008
strasser am chestnut 300 Blight Takes a Bite Out of American Chestnuts Chestnut Blight Cryphonectria parasitica April 2008
whirling disease 1 Putting a New Spin on Trout Myxobolus cerebralis Whirling Disease March 2008
water lettuce rybicki mattawoman Creek 2007 01 Potomac River’s Floating Salad Bar Has No Takers Water Lettuce Pistia stratiotes January 2008
2199090 PPT Red Alert for Redbay? Laurel wilt and Redbay ambrosia beetle Raffaelea lauricola and Xyleborus glabratus December 2007
rusty crayfish Another Case of Good Bait, Gone Bad Orconectes rusticus Rusty Crayfish November 2007
Miscanthus morninglight kyde Chinese Silvergrass Chinese Silvergrass Miscanthus sinensis October 2007
ailanthus flwr kyde Tree-of-Heaven is Really Stinking Tree-from-Hell Tree of Heaven Ailanthus altissima September 2007
Plt habit LPt Branch Pk S New Invader Waves a Red Flag Wavyleaf basketgrass Oplismenus undulatifolius August 2007
mitten crab lee mecum Feeling Crabby? Chinese Mitten Crab Eriocheir sinensis July 2007
humulus cody miller 1 Asian Vine Climbs into Maryland Humulus japonicus Japanese Hops June 2007
Pautom blossoms close up 5 9 06 S A Royal Procession in Maryland Princess tree or empress tree Paulownia tomentosa May 2007
calpear k kyde escapes rte50 Snowstorms in April? Callery Pear Pyrus calleryana April 2007
msx MSX (Haplosporidium nelsoni) MSX Haplosporidium nelsoni March 2007
varroa mite To Bee, or Not to Bee (with apologies to William Shakespeare) Varroa Mite Varroa destructor February 2007
2159012 PPT The Green Menace Emerald Ash Borer Agrilus planipennis January 2007
Berbeirs thunbergii plodovi Barry Rice Bugwood Not So Merry Exotic Barberry Japanese Barberry Berberis thunbergii December 2006
5449852 PPT Wineberry Wineberry Rubus phoenicolasius September 2006
pls 1 Coming Soon to a Wetland Near You! Purple Loosestrife Lythrum salicaria July 2006
5473560 PPT Everything Is Coming Up Roses Multiflora Rose Rosa multiflora May 2006
9005048 PPT New Viburnum Pest Headed South Viburnum leaf beetle Pyrrhalta viburni April 2006
5508937 PPT There’s a special providence in the fall of a sparrow House Sparrow Passer domesticus March 2006
2334761926 b9d04b1a4f z Little Green Invaders European green crab Carcinus maenus February 2006
5444407 PPT Sirex, You Say! Sirex woodwasp Sirex noctilio January 2006
5542727 PPT Japanese Honeysuckle Japanese Honeysuckle Lonicera japonica November 2005
geese young big Resident Canada Geese Resident Canada Geese Branta canadensis October 2005
SOD lilac National Effort to Contain Disease Underway Sudden Oak Death Phytophthora ramorum August 2005
5487145 PPT A Reed Too Common Phragmites / Common Reed Phragmites australis July 2005
1385006 PPT Mute Swan Mute Swan Cygnus olor May 2005
5450403 PPT Worst Weed in Maryland? Canada thistle / Creeping thistle Cirsium arvense April 2005
5560564 PPT Is a Bird in the Hand Worth Two in the Bush? Amur Honeysuckle, Morrow's Honeysuckle, Tatarian Honeysuckle Lonicera maackii, L. morrowii, and L. tatarica March 2005
5430720 PPT Rust on the Queen’s Crown Chrysanthemum White Rust Puccinia horiana November 2004
1237070 No Thank You, M‑A‑M! Mile-a-Minute Vine Polygonum perfoliatum October 2004
5444581 PPT When is it good to be out of GAS? Giant African Snails Lissachatina fulica September 2004
5389511 PPT Porcelainberry Porcelainberry Ampelopsis brevipedunculata July 2004
0002120 PPT An Invasive Species Success Story Water Chestnut Trapa natans June 2004
0660072 PPT A Pox in the Orchard! Plum Pox Plum pox virus (PPV) May 2004
5447768 PPT Public Education Happens in “Iv’y Towers” English Ivy Hedera helix February 2004
5487343 PPT From Wreath to Forest Oriental bittersweet Celastrus orbiculatus December 2003
5382326 ppt e1520623824141 Citizens Urged to Report Pest of Popular Ornamental Shrub Euonymus Leaf Notcher Pryeria sinica November 2003
5410810 PPT The Multicolored Asian Lady Beetle: A Mixed Blessing Asian lady beetle Harmonia axyridis October 2003
Microstegium vimineum One of the Fastest-Spreading Forest Weeds Found In 23 States Japanese Stiltgrass Microstegium vimineum September 2003
5475893 PPT Omnivorous Insect a Risk to Humans, Animals, and the Nursery Industry Red Imported Fire Ant Solenopsis invicta August 2003
0580062 Colonial Medicine Herb Plasters the Woods with Mustard Garlic Mustard Alliaria petiolata May 2003
2121079 PPT A Very Serious Menace Giant Hogweed Heracleum mantegazzianum April 2003
Hemlock woolly adelgid 768x512 Non-Native Insect Threatens Health of Popular and Beneficial Trees Hemlock Woolly Adelgid Adelges tsugae March 2003