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

Dairy Farmers Revive Old Customs

  • A revival of pasture-based agriculture in the Midwest is pleasing cheese maker's palettes. Photo courtesy of Uplands Cheese Company.

If you drive out into our Midwestern countryside these days, expecting pastoral scenes of placid cows grazing leisurely on grassy hillsides, you’ll be at least 50 years too late. Traditional pastoral herding practices, based on the summertime abundance of self-renewing grasses, has mostly disappeared. It’s been replaced by year-round production based on dried feeds grown from intensively worked soils. However, if you were to visit Pleasant Ridge Farm in Dodgeville, Wisconsin or a small number of other farms around the Great Lakes region, you would find a successful and quite modern, revival of pasture-based agriculture. You would also find an incredibly tasty cheese. The Great Lakes Radio Consortium’s Ed Janus reports:

Transcript

If you drive out into our Midwestern countryside these days expecting pastoral scenes of placid cows grazing leisurely on grassy hillsides, you’ll be at least 50 years too late. Traditional pastoral herding practices, based on the summertime abundance of self-renewing grasses, have mostly disappeared. It’s been replaced by year-round production based on dried feeds grown from intensively worked soils. However, if you were to visit Pleasant Ridge Farm in Dodgeville, Wisconsin or a small number of other farms around the Great Lakes region, you would find a successful and quite modern, revival of pasture-based agriculture. You would also find an incredibly tasty cheese. The Great Lakes Radio Consortium’s Ed Janus reports:


Although they own a dairy farm and milk 200 cows, Mike Gingrich and Dan Patenaude really don’t farm at all like their neighbors. They’re grass farmers and herders. Their cows feed themselves on well-managed, systematically rotated pastures of flavorful summer grass – on farmland that does not know the plow, or soil erosion. So fresh is their grass that their cows convert it into milk that is unusually rich in essential dairy flavors. As Mike explains:


“This rotational grazing was a way that we preferred to run a dairy. It’s easier on the soil, it’s easier on the animals, and easier on the farmer, I think, too. All of our land is pastureland. We graze our cows all summer long. That is unusual. So they’re eating a live plant. Pasture produced milk is sort of like going back in time. You know, a hundred years ago and earlier, all milk was pasture produced.”


As traditional dairy farmers, Mike and Dan’s labors had been both anonymous and poorly compensated. Their milk was combined with that
of hundreds of other farmers and processed into a standardized,
personality-free product. But, on the way to proving that herding could be economically viable, they learned that this method of farming also made a real difference in the richness and flavor of their milk.


“I had always heard from old-time cheese makers that the best milk for making cheese was the June milk when the cows were on that new pasture. And that’s the ideal stage… for both nutrition for the cow and the flavor development of these cheeses coincidentally. That’s why, for instance, dairy products from New Zealand will have a stronger dairy flavor because their national milk supply is grass-based. Whereas in the United States, our national milk supply is stored feeds predominantly, and they’re much milder, they don’t have these dairy flavors.”


Because of their system of rotational grazing that allows them to move the cows from pasture to pasture, their cows are regularly introduced to new and flavorful grass. That means that they have that strong tasting June-like milk from late spring through October. Finding a way to get that milk with its unique qualities directly into the mouths of consumers was the next step for Mike and Dan. They decided that making their own cheese was the answer. So, Mike got his state cheese maker’s license, apprenticed in a small road-side cheese factory and became a farmstead cheese maker.


“A farmstead cheese comes from the milk from a single farm.
It has the potential of having unique and different and interesting flavors that are not available in production cheeses. And that’s because the cheese maker is the same person that milks the animals. Because we use only our milk, and we manage our cows so differently than a
typical farm, we really get a substantially different milk, and then of
course the cheese that we make is only from that milk.”


To make a cheese worthy of their milk, Mike chose a French alpine cheese called Beauford as his model because it too is made from the milk of grass-fed cows that gives it a pronounced but subtle, earthy
flavor and color. Pleasant Ridge Reserve cheese, like its French cousin, is cave-aged and turned by hand at least fifty times. And like its French cousin it has something lacking in mass-produced cheeses. It has “terroir” – the flavor of a particular place and the character of the people who make it.


Apparently there is a place for “terroir” in America. Last year Pleasant Ridge Reserve was awarded the Best in Show by the American Cheese Society. This year Mike and Dan will sell 2,000 ten-pound wheels of their cheese to top-scale restaurants, gourmet cheese retailers and on their Web site, at prices many times what they would get if they just waved goodbye to their milk at their farm gate. And, happily for cheese lovers, Mike and Dan, like a handful of other Great Lakes states farmstead cheese makers have found a way to package some of the splendor from their grass.


For the Great Lakes Radio Consortium, this is Ed Janus.