Tag: elm

In Search of Resistant Butternuts

A program is trying to save another
native tree that’s being wiped out by an invasive
fungus. People who like the butternut are hoping
that by planting more seedlings, and tracking
mature trees, they’ll find some are resistant
to a blight that’s killing the butternuts.
Lucy Martin reports:

Transcript

A program is trying to save another
native tree that’s being wiped out by an invasive
fungus. People who like the butternut are hoping
that by planting more seedlings, and tracking
mature trees, they’ll find some are resistant
to a blight that’s killing the butternuts.
Lucy Martin reports:


Butternuts are rich in history. Native Americans used the tree for
medicine and dye. They ate the nuts. During the Civil War, so many
Confederates used the tree’s yellow-brown dye to make home-spun
uniforms that their army picked up the nickname “butternuts.”


Wood ducks, finches and songbirds eat the tree’s spring buds. The fall
nut crop feeds woodpeckers, turkeys, squirrels and other wildlife.
The tree’s hard wood resembles walnut, but with a lighter, golden tone.
That’s why it’s sometimes called “white walnut.”


The trees are seriously threatened by butternut canker, an invasive,
airborne fungus. The blight was first noted in Wisconsin in 1967. In
some states, up to 90% of all butternuts are now affected, but there’s
work underway to try to save the butternut before it’s wiped out.


Tucked in an old orchard, a cold-storage room serves as a distribution
station. Each spring, this is where the Rideau Valley Conservation
Authority gives away seedling trees to the public. Project technician
Rose Fleguel gave me the tour:


“So, I think there’s about 100,000 seedlings here. These are boxed or
bagged so that the trees stay moist and dark. We’ve already spent two
days re-packing into individual landowner tree orders.”


At this time of year, the dormant seedlings just look like twiggy
sticks. Many are still wrapped in brown paper sacks. Conservation
agencies plant all kinds of trees. But sometimes they target very
specific problems, like butternut canker.


“My thing is the Butternut Recovery Project, whatever amount of land
can sustain 10 seedlings, then you’re free to take the seedlings and
plant them out. ‘Cause what we’d like to do is get the seedlings out on
the landscape, get them growing. Replace the ones that have been killed
by this disease, already, and that continue to be killed, and hope for,
I mean, it’s going to be, it’s going to be a shot in the dark, but hope
that maybe some of these seedlings might be resistant.”


“Hope” is the key word. It’s not clear whether any butternuts are
resistant to the canker blight. The seedlings being handed out are
from trees that are still healthy. This recovery program also maps
mature trees and keeps track of the ones that still seem to be canker-
free. It’s a long shot, called “find the resistance.”


Rudy Dyck is the Director of the local Watershed Stewardship Services.
He says you can usually see if a butternut has been attacked by the
disease:


“Look for black patches, black streaks, black sooty areas on
the main stem, at the root collar, and always look on the underside of
the large branches, because that seems to be where the canker first
infects.”


“And if you notice that, is there anything to be done?”


“No, there’s nothing you can do. We’re asking people to keep them, as
long as they can. But one of the reasons that butternut is in such
extreme danger of extinction is that it just does not regenerate very
well.”


Dyck says that’s why it’s important to conserve existing trees.
Butternuts don’t bear seed each and every year. And when they do, the
nuts tend to get gobbled up. Growing new butternuts takes a few tricks:


“You have to stratify them, or prepare them for growing, the next
spring. So they have to spend a few months in kind of freezing
temperatures, an un-insulated garage in a pot of peat moss, or
something. Another strategy some people do, is they bury the nuts in
the fall, and they cover them with chicken wire, and then that protects
them from squirrels during that fall period and, as they start to grow
next spring, you can transplant them.”


Dyck says US and Canadian agencies are sharing ideas and results
because diseases don’t stop at borders:


“There’s literally thousands and thousands of heavily cankered, dying
butternuts out there, and we really want to focus on looking at
healthy, canker-free trees. Because those are the trees we want to get
into our geo-data base, for future seed collection, those are the trees
that may hold some resistance and those are the trees we want to
track.”


Butternut canker isn’t a well-known problem. The beautiful trees are
too big for most yards. They’re usually sparsely scattered in forests,
or old farmsteads. But Dyck says the butternut has an important place
in nature.


“There’s no question, bio-diversity and having many, many types of
ecosystems, habitats, species. They all interact, they all count on
each other, and it all makes for a healthier environment and place for
us all to live.”


Many native trees such as the chestnut, elm, and now the ash, are under
attack from invasive diseases or pests. The butternut is yet another
tree biologists want to save for future generations.


For the Environment Report, I’m Lucy Martin.

Related Links

Budget Cuts to Fuel Ash Borer’s Spread?

  • When an emerald ash borer has infected a tree, white-colored larvae can be found under the bark. (Photo courtesy of the Michigan Department of Agriculture)

U.S. senators are asking the Department of Agriculture for emergency funding to help control the spread of the emerald ash borer. The burrowing tiny insect has already killed millions of ash trees. The emergency funding request comes as Congress has severely cut federal funding for the program. That’s forced states to change the way they fight the spread of the beetle. The GLRC’s Mike Thompson reports because of the federal budget cuts and a lack of state funding, experts fear the infestations could spread:

Transcript

US senators are asking the Department of Agriculture for emergency
funding to help control the spread of the emerald ash borer. The
burrowing tiny insect has already killed millions of ash trees. The
emergency funding request comes as Congress has severely cut federal
funding for the program. That’s forced states to change the way they
fight the spread of the beetle. The GLRC’s Mike Thompson reports
because of the federal budget cuts and a lack of state funding, experts
fear the infestations could spread:


(Sound of chainsaw and worker)


In 2002 the emerald ash borer was first discovered in southeastern
Michigan. Soon after that federal and state officials determined the
chainsaw was the best way to fight it.


(Sound of tree falling)


Since the tiny beetle arrived, officials estimate the insect has killed – on
its own – more than 15 million trees in Michigan, Indiana and Ohio, and the
infestations keep spreading.


There is no known natural predator for the ash borer; no known
pesticide. The experts believe the only way to stop it is to destroy it by
cutting all ash trees within half a mile of a known infestation.


Dan Herms is an entomologist at Ohio State University. He serves on the
ash borer science advisory panel. He says the beetle threatens all of
North America’s 8 billion ash trees.


“If the spread of the insect can’t be contained to Michigan, it will
continue to spread to Ohio and throughout the Eastern United States,
killing all the ash trees. Essentially it’s going to do to ash what
Dutch elm disease did to elm and what chestnut blight did to chestnut.”


Over the past two years the three infested states have cut down
hundreds of thousands of ash trees to stop the spread, but cutting was the
preferred method when the federal government was picking up the tab.


In 2004, the federal government allocated some 41 million dollars for
protecting and cutting down ash trees. That funding slipped to 27
million dollars last year. In 2006 the federal government ash borer
funding has dropped to 8 million dollars – just one-fifth of what it was
two years ago.


Getting at the reasons for the budget cut is difficult. State agriculture
officials defer to federal agriculture officials who defer to Congress.


The U.S. Department of Agriculture’s Ash Borer Program coordinator
Craig Kellogg theorizes the war in Iraq and Hurricane Katrina forced
lawmakers to cut funds.


“We can always speculate between all the other programs that are going on at
USDA, the cost of war, the cost of the hurricanes and the clean-ups and
all that good stuff, but we are not at the level that we were given the full
reason why we were cut.”


So with little federal money, most of the pre-emptive cutting of ash trees
has stopped. OSU entomologist Dan Herms says he’s concerned.


“It worries me extremely because if the funding is not restored such to
allow at least the opportunity to stop the spread of the insect in northwest
Ohio it will spread throughout the eastern United States, and it will cost
hundreds of billions of dollars in damage.”


The USDA and the states have shifted focus. States will use the federal
funding they receive to monitor the spread of the insect, enforce
quarantines and educate the public. Ohio will cut trees only if they find
new infestations away from the northwest part of the state.


But if the threat is so great to Ash trees, why won’t the states spend their
own money to stop the spread of the emerald ash borer?


We asked Ohio Agriculture Department spokeswoman Melissa Brewer.


“Well, you know, the state has stepped up to the plate as far as having in kind services
and taking those programs and running with them. You know, as far as how much
money can be contributed and that kind of thing… I don’t know who to even direct you on that.”


Officials from the different states say with current state budget pressures,
it’s difficult to find the money to cut down ash trees, and now that
federal money has dried up, Indiana scientists say they’re not sure
cutting trees worked.


State officials and scientists say the emerald ash borer is a national
problem and it should be the federal government’s responsibility to pay
the protection costs.


For the GLRC, I’m Mike Thompson.

Related Links

Groups Work to Restore American Elm

  • The American Elm was devastated by Dutch elm disease. (Photo courtesy of VA Department of Forestry)

The American elm was found throughout forests in the Midwest before Dutch elm disease took hold. The disease cut the population of elms by more than half. Now, the U.S. Forest Service wants to re-establish the stately tree. The Great Lakes Radio Consortium’s Sandra Harris reports:

Transcript

The American Elm was found throughout forests in the Midwest before Dutch elm disease took hold. The disease cut the population of elms by more than half. Now, the U.S. Forest Service wants to reestablish the American Elm. The Great Lakes Radio Consortium’s Sandra Harris reports.


The Forest Service is working with the U.S. Army Corps of Engineers on a small tree-planting project along the Mississippi River. Randy Urich is a natural resources officer with the Corps. He says it’s one of several similar projects aimed at brining back American Elms.


The trees were once a major part of flood plain forests. Urich says the tree was lost to Dutch elm disease beginning in the 1930’s.


“One of the characteristics of elm is that it’s very tolerant of shade, and in these floodplain forests you have a tendency to get some very dense overstory canopy, and because of that shade tolerance, the elms are really good at regenerating themselves.”


Researchers are developing disease-resistant American Elms by using various cloning techniques, including cloning trees that have naturally survived the disease.


For the GLRC, I’m Sandra Harris.

Related Links

Tackling an Invasive Beetle

Foresters think they might be on the verge of eradicating a pest that destroys trees. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

Foresters think they might be on the verge of eradicating a pest that destroys trees. The Great Lakes Radio Consortium’s Lester Graham reports.


The Asian long horned beetle attacks maples and elms. The bug first appeared in 1996, after wood crates infested with the beetle were shipped to New York from China. A second infestation appeared in the Chicago area in 1998. Stan Smith is a manager of the tree nursery program for the Illinois Department of Agriculture. He says the Asian long horned beetle might be under control around Chicago.


“Our population, we feel, is small enough that it might be getting to the point where it might not be able to reproduce very well. Hopefully within four to five years we’ll have everything pretty well cleaned up. At least that’s what we think can happen.”


The beetle is more widespread in New York, but fortunately the insect can’t fly very far. That means it can’t spread quickly, giving foresters a better chance at eliminating the pest.

Return of the Elms

Nearly every American city has an Elm Street. That’s because the elm was once one of the most abundant species of trees in North America. It was beloved for its distinctive shape and crown of limbs that arched over city streets. Unfortunately, starting in the 1930’s, at least a hundred million elms are estimated to have been wiped out by Dutch Elm disease. Relatively few elms managed to survive the epidemic. But now, Cincinnati is in the vanguard of a movement to bring back the elm. The Great Lakes Radio Consortium’s Steve Hirschberg reports: