Battling Alien Invaders
Making war on phragmites and other flora that take no prisoners
by Carrie Steele
Its not a glamour job, tromping through the marsh in hip-waders and canvas jumpsuit to slash through thick, endless clumps of reeds in the hot sun.
Sometimes it reeks.
The smell is really bad, says Mark Smith of Maryland Department of Agriculture. Sometimes at days end, it takes more than one shower to wash it off.
Sometimes its hard to see the trees for the forest, too. Slip into a camouflaged, booby-trapped four-foot-deep creek, and water shoots over your waders, while thick mud holds onto your boots like the Jaws of Life.
Fighting the Battle
On a sunny autumn morning, Smith and Judy Edelen pulled their khaki Department of Agriculture pickup near their targets: patches of phragmites on a two-acre private lot near the Severn River Bridge in Annapolis.
It was so thick, the homeowners couldnt even see the river, says Smith of the enemy. Phragmites just keep creeping in; these homeowners are trying to recapture their land.
Smith and Edelen, who work for the Office of Plant Industries and Pest Management at Marylands Department of Agriculture, were responding to a homeowners repeated cry for help. Theyve been at this very spot before with the big herbicide tank, pump motor and yards of hose to rescue yet another tideline from the grip of aliens.
But the invaders return, no matter what Smith does or how much poison he spreads.
The duo treated this area before Hurricane Isabel, only to have the storm wreck their work. To kill, their herbicide must flow down the plant stem into the rhizomes, underground stems that generate new roots and shoots. In the storm, many of the shoots broke off and Roundups work was interrupted. The reeds came back.
Phragmites just out-competes everything in its niche, says Smith. It says this niche is mine.
Areas where Smith and Edelen had managed to banish the leafy intruders have sprouted a diversity of native plants: switch grass, persimmon, mares tail and more plants that know how to share habitat.
Lets see what good we can do, Smith says over his shoulder before disappearing into the phragmites jungle. Smith trailblazes, fighting through the dense reed wall to get to the starting point. Then he sprays his way back to the truck. His green sprayer hose trails behind him like a lifeline. But its really a death line, for through it Roundup is propelled from the tank over the phragmites.
Sometimes I cant even tell where he is in the phragmites patch except for seeing the spray, says Edelen.
Smith sprays 100 gallons on the stalks and leaves until the leafy stand glistens. Once the herbicide is absorbed through the leaves, it gets into the plants system, killing roots, shoots and all.
Smith and Edelen take such phragmites-busting trips three or four times a week in the late summer and early fall.
Invasion of the Wetland Snatcher
Its all in the strategy. When tribes or groups invade other lands and countries, armies either swarm in or sneak undercover by the black of night.
Invading plants use both these strategies.
Like the infamous northern snakehead fish, non-native plants, too, can get too big for their niches. Vines, bushes, shrubs, trees, grasses and water plants invade, ravaging their conquered territory.
In the Florida Everglades, the Chesapeakes distant, marshy cousin, such invaders as old world climbing fern have blanketed the river of grass in lovely green death.
In Chesapeake Country wetlands, we battle phragmites austrais, the common reed. Armies of phragmites have invaded Maryland wetlands, forming thick stands that choke out native plants and starve out resident wildlife. The reed has conquered as much as 50,000 acres in Maryland, according to U.S. Fish and Wildlife Service biologist Doug Forsells best guestimate. Thats nearly 50 times the acreage of pumpkins grown in Maryland last year.
Forsell bases his figure on a mid-1990s survey that found 8,500 acres of phragmites just along the Bays wet borders. Id guess that amount has at least doubled or tripled since then, he says. And that number doesnt even reflect acres of phragmites plaguing creeks and streams not directly on the Bay. Theres gobs of phragmites that arent on the edges of the Bay.
Department of Natural Resources does not take a census of phragmites, but Jonathan McKnight, associate director of habitat conservation at the department, calls it the worst wetland invasive plant on the Chesapeake.
Worse yet, the numbers keep growing.
The difficulty is that it spreads every year, McKnight said.
Its creeping into wetlands near and far. Marylands battle is one repeated all over the East Coast. Drive north along I-95, and youll realize that Maryland isnt the only state with plant battlegrounds: Phragmites line the highways in some areas. Fields brimming with phragmites taunt New York Citys skyline. Theres probably an invasion very near you.
Walking past a stand of phragmites is like walking next to bamboo or a leafy wall. The constant, soft rustling of their long leaves sounds like a rainstick turned upside down.
Dont be fooled by their peaceful and calm demeanor: theyre not to be trusted.
If your house is near the water, says U.S. Fish and Wildlife Services Julie Thompson, it could be overwhelmed if just a couple plants become established.
Profile of a Pest
|Not only does phragmites proliferate through the seeds at its bushy flowering top; the plants rhizomes stretch underground, spreading the invasive and matting the soil so other plants cannot compete.
Natives of Europe that have immigrated worldwide, phragmites are perennial grasses that can grow to 20 feet tall. The name comes from the Greek word phragma, which means fence, a reference to its density.
Theyre a pretty problem. The stalk bears long, thin leaves that ribbon into a point. The flowers rise from the reeds in plumes that look like feather dusters.
These grasses creep along tide lines, stalking nearly fresh and brackish wetlands and lakes and streams. As eager as they are to establish their extensive root systems, theyre picky about how wet their feet can be, growing only in semi-dry areas in and adjacent to wetlands.
Phragmites doesnt really like deeper water areas, says Smith.
Otherwise, its tastes are broad. It can endure acidic soils, standing water and fresh or brackish wetlands. Its favorite spots, however, are recently disturbed areas, where it can grab a spot of bare land. Like insurgents, phragmites sprawls underground. The root system creeps under the soil, shooting up new stalks and expanding the colony like a giant form of crabgrass. Once phragmites has colonized, theres no return for native plants, which are no match for these matted rhizomes and dense clusters.
Phragmites can also spread by seeds, which grow on their plumed heads and drop or drift into nearby soils to begin a new colony.
Its very good at transporting itself, said McKnight. When big chunks of rhizomes break off and float around or when seed distributes, its like mold in a Petri dish.
Adds Smith, As a wetland species in that niche, phragmites has the playing field to itself.
A Dangerous Foe
The ability to occupy acres is the characteristic that makes phragmites infamous.
From a biosphere standpoint, its extremely serious, says Smith. Its crowding out indigenous species and destroying habitat.
Dense forests of phragmites leave little room for diversity, which is the heartbeat of ecology. The more diverse your flora, the more diverse your fauna, says Smith.
Some species, such as red-winged blackbirds, can make their home in phragmites, but by and large the mono-culture that phragmites creates makes a wetland much less diverse. Because wetlands host waterfowl, they support an ecology that stretches across continents. Our greatest density of wetlands is on the Eastern Shore.
Once phragmites are removed, native plants have a chance to come back.
Native vegetation comes back much faster in freshwater areas than in brackish, because theres more species, says Fish and Wildlifes Thompson.
But getting rid of phragmites is a big job.
None of us are fooling ourselves that well eradicate phragmites in the near future, McKnight said.
Dollars Are No Match for Weeds
Where phragmites puts down roots, it absorbs dollar signs.
A couple hundred acres of phragmites can cost $5,000 to $10,000 per year to treat, says Maryland Department of Natural Resources waterfowl habitat manager Donald Webster. Even 50 acres to me would be costly, he adds.
This year, only 2,500 acres of phragmites has been targeted for destruction. To poison, slash and burn that fraction of the invading army, many Maryland and federal agencies mobilize forces and dollars.
For the work of soldiers like Smith and Edelen and for chemicals bought to control phragmites, Department of Agriculture says it doesnt spend a dime. Thats because the program pays for itself with revenue earned from landowners who hire agriculture staffers as mercenaries to fight the invader, according to Mark Smith of the Office of Plant Industries and Pest Management.
Maryland Department of Natural Resources also gets involved because their Wildlife and Heritage program works to conserve diverse native wildlife, plants and the natural communities that support them. To help control phragmites on the property of some 400 to 600 landowners who seek help, the department spends some $50,000 each year, according to Webster.
Landowners can also appeal to the Federal Wildlife Habitat incentive program for federal funds that can amount to up to 75 percent of their costs.
U.S. Fish and Wildlife Service spends a couple more thousand dollars each year, according to Thompson, to wrangle phragmites. Their first priority is not private land but wildlife management areas.
We focus on major preserves, areas where theres extensive phragmites, such as Chesapeake Bay Environmental Center in Grasonville, Thompson says. Private landowners are a second priority.
Other non-profit groups are allies in the war. Chesapeake Wildlife Heritage, an Easton-based conservation group that helps public and private landowners manage for sustainable agriculture and wildlife habitat, spends $17,000 to $20,000 annually to help landowners fight phragmites.
In 2000, Maryland spent $1.8 million to battle invasive plants, according to Carol Holko of the not-for-profit Maryland Invasive Species Council.
We have nowhere near enough resources in the state, she said. Theres more organized programs to battle invasive animals and insects, but funding for weeds is pretty dismal.
Meanwhile, in the Everglades
In contrast to Marylands piecemeal struggle against alien invaders in Chesapeake Country, Florida has mounted an organized campaign to rid its comparable treasure, the Everglades, of plant invaders bent on running out native species.
To fight invasive species, last year the South Florida Water Management District spent $25 million. Thats about 14 times what Maryland spends annually.
Top among the expansive invading army is lygodium, that old world creeping fern, and melaleuca, a paper-bark tree from Australia that grows in almost any environment or soil. In its native land, over 400 insects eat melaleuca. In the Sunshine State, nothing does, so the tree spreads unchecked, like our phragmites.
With a longer growing season, were seeing problems reach us obvious early, said Dan Thayer, head of exotics program for the South Florida Water Management District, which manages water resources for a broad swath of Florida that includes the Everglades.
With such prime growing conditions, Floridas everglades are constantly under attack from invasives. We have thousands of acres where no other plant can be found, Thayer said. They come without the complement of herbivores and diseases that keep it checked naturally, so they have a competitive edge.
Still, Florida is fighting back.
Weve removed 80 percent of the melaleuca on public lands through a long battle, says Thayer of a campaign fought by air and tree to tree by foot soldiers. Weve made good process.
In Maryland, however, invaders of many kinds have got the upper hand.
Armies of Invaders
|photo by Carrie Steele
Kate Toniolo of the Patuxent Research Refuge balls up the annoyingly prickly invader mile-a-minute.
Phragmites is the northern snakehead of the plant world, but its not our only invasive flora.
Rumor has it that phragmites was brought over from Europe in the late 1700s as stowaways on ships. Many other plant invasives often arrive as invited guests until they crowd out native species. Among such alien invaders are kudzu, mile-a-minute, multi-flora rose, hydrilla, honeysuckle, Chinaberry, wisteria and English ivy. Most were planted for looks or ground cover.
Lots of non-native plants earn their welcome. Like tulips, says Patuxent Refuge biologist Marilyn Eames, who organizes raiding parties of Weed Warriors. You dont see tulips running amok.
Running amok is what makes an alien a pest.
Kudzu is a terrestrial vine that, like phragmites, preys on disturbed land. Marylands biggest infestations can cover some six acres, but kudzu most often gobbles half- to one-and-a-half-acre areas.
And like phragmites, kudzus occupied territory is uncharted. What is known, says DNRs McKnight, is that numbers are growing larger each year. Yet, he adds, we dont have any major funding initiatives for kudzu.
Even kudzu is more manageable than phragmites. Because its a terrestrial vine, its much easier to get to, says Department of Agricultures Smith.
The Maryland Invasive Species Council a group of 35 scientists, land managers, government reps and concerned citizens formed in 2000 lists 44 invasive plants to watch out for. Thats along with seven plant viruses and fungi, and 30 insect, invertebrates and vertebrate invaders.
Invasives even compete with each other at times: Sometimes mile-a-minute will actually grow over the top of phragmites, says Smith.
The mile-a-minute vine, with its tiny thorns and energy to live up to its name, has to be treated before sprayers can even get to the phragmites. As Eames and her Weed Warriors pulled mile-a-minute off of Japanese barberry last month, they found Japanese beetles dining on the triangular leaves.
In these cases, its almost a chicken and the egg question, said Eames: Is it better to have an invasive pest eating an invasive plant rather than a native plant?
The answers lead to more questions, unknown factors and road blocks, creating webs of reasoning that almost mimic the intruder vines themselves.
But as for the invasives, theyre single-minded: All they want is to survive and reproduce.
Theyll reach those goals by any means.
Weed Warriors on Patrol
|photo by Carrie Steele
Patuxent Refuge biologist Marilyn Eames pulls and untangles
mile-a-minute from native plants.
Phragmites traveled as an intrastate stowaway onto Patuxent Wildlife Refuges North Tract.
We dont have a lot of phragmites, but what we do have is the result of construction, said Eames, a biologist at Patuxent Research Refuge, where there are plans to spray herbicide on the seven to eight patches this month. I hope we can knock it out hard. Its been here for 10 years.
Shes hoping for another success like the banishing of purple loosestrife. That slender stem lined with small leaves and tiny orchid-purple flowers once dwelled on refuge soils but was pulled off by biologists and volunteers several years ago, Eames reports.
Its only one species, but its proof that Patuxent Research Refuge doesnt take plant invasion lightly.
On one sunny August morning, it was the tenacious mile-a-minute vine that was under attack. Eames led a team of four Weed Warrior volunteers into the refuge to thread the wire-thin vines and triangular leaves out from tree branches. Volunteers balled up the vines as they snaked into the underbrush, tracing the prickly threads down through grape vines, shrubs and other plants until they reached the shallow, reddish roots drawing up from the soil.
Its annoying-prickly, said Kate Toniolo, outdoor recreation planner for the refuge. You can feel the thorns but not see them.
Thats why volunteers Eric Tang from Clarksville and Martin Liu from Ellicott City, both high school juniors, donned heavy gloves before snaring mile-a-minute from leafy branches five feet above their heads and entangled around shrubs.
Hand-pulling is the most effective way to treat this invasive, said Eames. It absolutely makes a difference.
The name mile-a-minute may be an exaggeration, but at six inches a day, this invader can quickly block sunlight to trees and shrubs. By the side of a dirt road at the North Tract, it doubled back over itself, creating mats of leaves and vine, entangling anything in its path.
This one never ends, said Toniolo as she wrestled her two-foot-wide ball of mile-a-minute, thought to be imported from Japan as an ornamental.
Invasives love disturbance. They just take off, said Eames.
Gripping the lush green vines, Eames and her team of volunteers were equally concerned with confiscating the blue berries, each about the size of a peppercorn kernel, that are the main spreaders of these plants.
Birds eat the seeds and defecate them into new areas, Eames said. Add a little direct sunlight, and mile-a-minutes sprouts could mean the end of nearby foliage.
Anyone can get it out of their backyard, Eames said, so that birds cant spread the seeds.
After an hour and a half of hand pulling, yielding four large garbage bags of mile-a-minute, Eames called it quits.
Id say we put a very significant dent in it, she said as the team of five loaded back into the car for the ranger station, where Technu was slathered on to prevent poison ivy, an invasive native.
On the way back to the ranger station, Eames sighed as she gazed out on new patches of mile-a-minute cloaking the shapes of trees and shrubs, Oh, look! Its all over to the left.
Though smarting from Technu, her two high school students left feeling victorious.
It was fun, said Tang. I want to come back and do it again.
Rooting out the Problem
At the Patuxent Research Refuge, many more recruits help battle invasives. Among helpers are the Maryland Native Plant Society, Anne Arundel Master Gardeners, Maryland Department of Natural Resources, the Friends of Patuxent and more. The refuge has also joined with Fort Meade to capture a $17,400 matching grant from the National Fish and Wildlife Foundation to control invasive species on both properties.
Protection for wildlife habitats often includes money for fighting invasives. Three weeks ago, $905,000 from the U.S. Fish and Wildlife Service created the Maryland Landowner Incentive Program to restore habitat for rare and threatened plants and animals inhabiting private lands. The voluntary, cost-share program reimburses landowners up to 75 percent of the cost in restoring habitat for declining species such as dwarf wedge mussel and bog turtle, both of which are federally listed species. Maryland has more than 600 plant and animal species at risk, and most survive on private land.
On the horizon also is a newly formed regional panel for aquatic nuisances, which targets phragmites. And under the Chesapeake 2000 agreement, phragmites is one of six species with planned management.
Were not putting a dent in phragmites, but were able to keep some of these wetlands more diverse, says DNRs Webster. At the best were just breaking even. Theres just not enough money in coffers. Were not ever going to be phragmites free in Maryland.
But that doesnt stop people from dreaming.
Eradication would be wonderful, says Kerrie Kyde, habitat ecologist at DNR. But in practical terms, its reduction that we can hope for at best.
Annoyance and Awe
Whether youre battling the reedy invaders in your own yard or dreading encroachment on your favorite park, landowners, volunteers and state agencies are pushing back phragmites in Chesapeake Country wetlands.
That a plant can create so much stir is in itself amazing.
We were in phragmites the other day that were easily 20 feet tall, says Smith. Think of the amount of biomass that it creates every year. Its ability to thrive is really impressive.
|About the Author
In researching this story, staff writer Carrie Steele joined the ranks of Weed Warriors at Patuxent Research Refuge.
by Carrie Steele
Getting rid of reedy squatters takes more than simple weeding. Tearing out the stalks of the plant may be a quick fix, but dont be fooled. The real powerhouse behind phragmites remains buried in the underground root mass. You can reach for the shovel, but broken roots can re-sprout and spread farther.
To banish the pests for good, or at least for the time being, youll need to treat chemically with a glyphosate, an herbicide that kills phragmites leaves, stems and the stealth reproducers of the plant, rhizomes.
Spraying glyphosate, an aquatic herbicide approved by the U.S. Environmental Protection Agency for use in wetlands, is the best perhaps the only way to get rid of these grasses.
Glyphosate is an aquatic herbicide that kills phragmites but is virtually non-toxic to mammals, birds and fish, according to Department of Natural Resources website. Glyphosate is the active ingredient in main-line herbicides such as Roundups aquatic cousin, Rodeo. This chemical is formulated to kill the entire plant, including the underground invasive rhizomes.
To apply herbicide, youll need a wetlands permit, which you can apply for, and a foot soldier with a Category Five application permit to spray your propertys pests with herbicide.
Diluted to six pints per acre and combined with a surfactant, which speeds the chemicals entry into the plant, Roundup can be sprayed from a truck, a backpack, a helicopter or a boat.
Homeowners with large stands of phragmites may need the departments assistance. You really need to mobilize a helicopter to be effective, said the Department of Natural Resources Jonathan McKnight.
Powerful as phragmites is, its not invincible. It has an Achilles heel: phragmites is a poor invader of well-vegetated areas. The long growing season of phragmites is its second weakness.
Thats the vulnerability exploited by DNR and the Department of Agriculture. Herbicide is applied in the fall, before the first frost, when most other desirable plants enter dormancy and are not harmed by the sprayers chemical cure.
Phragmites absorb the herbicide through the leaves and stalk; then phragmites rhizomes and roots get a taste of toxin and the whole plant dies. Six to eight weeks later, youre phragmites free if youre lucky. Sometimes treatments in consecutive years are needed to wipe out stands.
Some areas can be burned afterwards to get rid of the matted maze of rhizomes.
In muddling through these wetland worries, youre not alone in the jungle.
Some private landowners can turn to DNRs cost-share program.
We dont have much in the way of funding, so its limited to the Eastern Shore, said Department of Natural Resources Donald Webster. We provide financial assistance with the chemical; then the landowner pays for the actual application.
Offering a broader cooperative program to help private landowners tame their phragmites jungles is the Department of Agriculture. At an initial site visit, staff assess the area and explain options: herbicides, physically removing plants or weed whacking.
|photo by Carrie Steele
Judy Edelen, with the Office of Plant Industries and Pest Management at Marylands Department of Agriculture, watches as co-worker Mark Smith disappears amid the sea of phragmites.
Department of Agriculture can help you fight your way through the jungle of paperwork, too.
We help the landowner apply for wetlands permit and bring in expertise in getting herbicides applied, says Mark Smith of Maryland Department.
Department of Agriculture works mostly with homeowners and people who have fewer than 200 yards of river frontage. It also fights phragmites in areas where helicopters cant go for security or other reasons, says Smith. The property by Severn River Bridge, for instance, is too close to the Naval Academy for a helicopter pass.
A few non-profits in the area are pitching in to help landowners, too. Chesapeake Wildlife Heritage offers assistance to landowners in Anne Arundel County and the Eastern Shore. Its goal is to spray hundreds of acres of phragmites this fall with herbicide, says the organizations Sandy Parker.
Only in the past three years has the state been chemically treating these armies of invasives.
Ideally, we can take care of a small patch before it gets to be a 200-acre patch, said McKnight.
Get advice or assistance in removing phragmites on your property from Maryland Department of Natural Resources (410-827-8612) or Department of Agriculture (410-841-5871). Find more information on invasive plants in Maryland at www.mdinvasivessp.org.
|Phragmites Arent All Bad Guys
Not all phragmites are created alike: There are actually two varieties that claim Maryland as home.
First is the invasive Phragmites australis youve been reading about.
The second variety, the lesser-known native phragmites, is smaller, less robust, redder and not a problem, according to Department of Natural Resources Jonathan McKnight.
In fact, Maryland has the largest population of native species of East Coast states, according to department habitat ecologist Kerrie Kyde.
The two varieties are hard to tell apart, said Kristen Saltonstal at Horn Point Laboratory in Cambridge. There are a few things you can look at, but youd need to do some exact measurements or get an expert to really be able to tell.
In Maryland, the native variety grows along the Eastern Shore, up-side creeks where freshwater flows. There are no known stands on the Western Shore, Saltonstal said.
The non-native variety, which youll encounter far more often, may have traces of good. As much of a problem as phragmites presents, it does help control erosion by holding soil in place. But simply holding soil doesnt make it an asset for any ecosystem.