Pigs Root Out Evil Bugs

  • Apple grower Jim Koan has discovered that baby pigs are best for taking care of fallen wormy apples in his orchard. He says they have very tender noses. The adult pigs like to root around in the dirt and tend to tear up the orchard. (Photo by Rebecca Williams)

There are a lot of insects that love to eat
apples. A harmful insecticide that kills some of
those pests is being phased out. So farmers are
looking for other solutions. Rebecca Williams visits
an apple grower who’s counting on pigs to get some
help with his pest problem:

Transcript

There are a lot of insects that love to eat
apples. A harmful insecticide that kills some of
those pests is being phased out. So farmers are
looking for other solutions. Rebecca Williams visits
an apple grower who’s counting on pigs to get some
help with his pest problem:

(farm animal sounds – turkeys, etc)

The spring rains have started, and at Jim Koan’s pig pen that means mud.

(sound of shoes squishing in mud and piggy snorts)

Of course, these pigs don’t really seem to mind that.

“These Berkshires, you can see, are really friendly, they’re just coming
right up to you.”

Jim Koan really likes his pigs. That’s because he’s hoping the pigs will
take care of one of his worst pests. It’s a beetle called the plum
curculio. In early spring the beetles lay eggs in the little green apples.
The larvae hatch and eat the apples from the inside out.

Then the tree drops the bad wormy apples on the ground. And the worms just
keep on eating.

For a long time, farmers used an insecticide called azinphos-methyl to kill
the beetles. But the Environmental Protection Agency is phasing it out.
That’s because the EPA says the pesticide is very toxic to some wildlife and
it can make farm workers sick.

Jim Koan hasn’t used the pesticide for 10 years, ever since he became an
organic grower. So for years now he’s been trying to find a perfect
predator to stop the beetle larvae.

The chickens were too lazy. Hawks ate the guinea fowl that he tried.

So, finally, Koan says he had a flashback. His grandpa used to have hogs in
the orchard.

“When I would climb up to go up in the tree in the summertime to get a green
apple to eat all the hogs would come running over there and my granddad
always told me you stay away from those hogs they’ll eat you up! I’d be
really scared and be up there for an hour or two until the hogs left again.”

(laughs)

Koan says he knows now that the hogs were just hoping for a snack. So last
year he decided to buy some hogs and see if they would eat the wormy apples
on the ground. He says baby pigs worked best.

“And they’d just go up one row gleaning it, kinda like little vacuum
cleaners (makes sucking sound) and suck up all the apples!”

Koan says the baby pigs ate 98% of the fallen apples with beetle
larvae in them. But he still needed to know that the beetles were actually
gone, so they wouldn’t come back to attack his apples next year.

That job
was up to researchers at Michigan State University. Koan says they fed a
mix of beetle larvae and apples to pigs on campus.

“Then they put diapers on the hogs – truly, diapers!! It was unbelievable.
They took special superglue and velcroed it on their butt so then when they
defecated they caught all that. Then they took these poor students and made
them go through there and wash all that and look for worms.”

Koan says out of 200 worms that were fed to the pigs, they only found one
worm at the other end. That means, so far it looks like pigs are a
pretty good predator.

But the researchers don’t want to let pigs run wild – just yet. David
Epstein is the lead researcher on the project.

“Jim and I are scheming all the time. I have great expectations that this
could be a good management tool in the future but we have to figure out how
to do it properly.”

Epstein says they need to make sure the pigs don’t cause any contamination
problems. Something like E. coli. He says so far there isn’t any
evidence of that, but it’s the kind of thing you have to be sure about.

If this all goes well, the farmer and the scientist will be writing a book
together. It’ll be sort of a self-help book: getting pigs to take care of
what’s bugging you.

For the Environment Report, I’m Rebecca Williams.

Related Links

Safer Wiggly Worms

People who go fishing might be attracted to a new environmentally friendly lure. Chuck Quirmbach reports:

Transcript

People who go fishing might be attracted to a new environmentally friendly lure. Chuck Quirmbach reports:

Soft plastic lures such as wiggly worms are often made more flexible by adding chemical compounds called phthalates. These chemicals have been linked to adverse health effects… and when the lures are torn off a hook, the compounds pollute waters.


Tim Osswald is a mechanical engineering professor at the University of Wisconsin. He’s helped a manufacturer come up with a process that uses tiny plastic fibers inside the lures. Osswald says the microfibers make the lures stronger.


“Using this technology they would no longer end up at the bottom of the lake. Or at least at a much, much smaller rate.”


Oswald says the lures no longer stretch like a piece of rubber but still turn and wiggle and have that ‘worm-like feel.’ He says the reinforced lure might cost a little more in the stores. But he says they’re likely to last longer.


For the Environment Report, I’m Chuck Quirmbach.

Related Links

Study: Anglers to Blame for Earthworm Invasion

Earthworms invading forests throughout the region are probably being introduced by anglers. That’s the conclusion of a new study. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Earthworms invading forests around the Great Lakes are probably
being introduced by anglers. That’s the conclusion of a new
study. The Great Lakes Radio Consortium’s Stephanie Hemphill
reports:


Earthworms are good for gardens. But in forests they eat up the
thick layer of leaves on the forest floor.


Lee Frehlich is with the University of Minnesota. He supervised
the study.

“Many of the tree seedlings and the wildflowers that live in the
forest are actually rooted in all of this leaf material. So when
the worms eat that, their rooting material is literally eaten out
from under them, so a lot of them die.”

The study found in some areas infested with worms, there were
half as many young sugar maples as in worm-free areas. Birds
that use leaves for nests on the ground could also decline.

Frelich says anglers should bring any unused earthworms back home
with them, rather than dumping them in the lake.

For the Great Lakes Radio Consortium, I’m Stephanie Hemphill.

Apple Growers Trim Pesticides From the Farm

  • Bill Erwin and a number of other Michigan apple growers are involved in a huge project to reduce pesticide use in orchards. Erwin says he's among those who will continue the practice.

No one likes the idea of pesticides in baby food. But nobody likes the idea of a worm in an apple either. So apple growers have been involved in a three year project to reduce pesticides, but still turn out a crop that’s not plagued by insects. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

No one likes the idea of pesticides in baby food. But nobody likes the idea of a worm in
an apple either. Apple growers have been involved in a three year project to reduce
pesticides, but still turn out a crop that’s not plagued by insects. The Great Lakes Radio
Consortium’s Lester Graham reports:


Gerber makes baby food. A lot of those little jars of fruit use apples in the mix. A few
years ago the Consumers Union, an arm of the magazine Consumer reports, called for the
end of the use of many of the pesticides that end up in children’s food. And the
Environmental Working Group issued a scathing report on pesticides in kid’s food. Like
other baby food makers, Gerber knew it had to do something. It started with improving
methods to wash off or peel off pesticide residue on apples. But, there was only so much
that could be done in the plant.


Todd DeKryger is with Gerber Baby Foods. He says Gerber’s plants did what they could
to get rid of pesticide residue, but it wasn’t enough.


“Our customers were telling us, ‘We don’t want residues in the products we buy from
Gerbers.’ We turn around and tell our growers ‘We need a product without pesticide
residues.’ And it’s really been amazing how they have really bought into that whole idea
of providing a product. You know, and they say ‘Hey, look. We fed our kids Gerber and,
uh, yeah, okay, this makes sense. Now, how can I help?'”


Gerber got some help from a firm based in North Carolina. The Center for Agricultural
Partnerships contacted Gerber at its main plant in Michigan as well as Michigan State
University’s Extension Service and apple growers. They had money to pay for
publications and free consultants for three years for growers who wanted to try a way to
control bugs in the orchards called ‘Integrated Pest Management’ or IPM.


Larry Elworth is with the Center. He says IPM. has worked for other types of fruit
growers, but expertise was needed for the particular climates and growing conditions in
Michigan’s apple orchards to make IPM effective.


“It’s become a way of managing pests that gives growers way more information to use so
they can actually outsmart the insects rather than always relying on a chemical as the way
to control them.”


(apple picking sound)


That all sounded good, but no one had tried it in the apple orchards on a large scale.


“Well, our main concern was whether it was going to work or not.”


Bill Erwin operates Erwin Orchards and Cider Mill.


(sound of rolling apples)


Apple pickers are plucking fruit and gently rolling the apples into a big wooden crate for
shipping to retailers. Erwin says it seemed risky to change farming methods in the
orchards.


“We’ve been used to the chemistries. We’ve been used to the program and, uh, we
weren’t sure that using lighter chemistries was going to work and we weren’t sure that we
were going to be able to control the bugs.”


Erwin says pesticides are reliable. They kill bugs. The fruit looks good. And the orchard
is nice looking in that there’s no wildlife, bugs, birds or otherwise in the area for very
long. But Erwin says all the beneficial insects, such as ladybugs and spiders that eat bugs
that ruin fruit were also gone. Erwin says he noticed something else that bothered him –
humming bird nests – but no baby humming birds.


So, Erwin and a lot of other Michigan apple growers gave Integrated Pest Management a
shot. Erwin says they found using tactics such as mating disruption of pests works. The
worm in the apple is actually the coddling moth’s larvae which burrow into the fruit.
Apple growers used the female coddling moth’s pheremones against the insect. By
saturating the orchard with pheremones, males didn’t know which way to turn to find a
mate. No mate, no eggs. No eggs, no worm in the apple. And Erwin says he noticed
something else.


“Now we find humming birds. We find little baby humming bird nests everywhere in this
orchard. We see bluebirds out here. You never used to see those. And, so, we know we’re
doing something good with the environment and that makes us feel good about this
program. They’ve taught us something and it’s gonna be something we’re going to keep
going with.”


And it appears the results are good.


The Center for Agricultural Partnership’s Larry Elworth says the three year project was a
success.


“Growers had at least as good if not better quality apple crops than they had before. Fewer bites
from insects chewing on the surface. A lot fewer worms that had burrowed inside the
apples which gave them a higher quality crop and they actually got more revenue for
their crop than they’d been getting before. And they were also able to reduce their overall
costs for controlling insects.”


Gerber Baby Foods is relieved. By getting orchards closer to its plant to reduce pesticide
use, it’s ensured a local supply of apples. Otherwise, it meant trucking in fruit from
farther away and paying more for fruit that met consumers’ demands for pesticide free
baby food.


For the Great Lakes Radio Consortium, this is Lester Graham.

Earthworms Alter Forest Ecology

Most of us think of earthworms as beneficial creatures. Gardeners are always happy to spot a worm in the flowerbed because they add fertilizer to the soil. Many anglers say they’re the best thing for catching fish. But scientists are beginning to learn worms aren’t so friendly to Great Lakes forests. The Great Lakes Radio Consortium’s Stephanie Hemphill reports:

Transcript

Most of us think of earthworms as beneficial creatures. Gardeners are always happy to spot a
worm in the flowerbed because they add fertilizer to the soil. And many anglers say they’re the
best thing for catching fish. But scientists are beginning to learn worms aren’t so friendly to
Great Lakes forests. The Great Lakes Radio Consortium’s Stephanie Hemphill reports.


(fade up Girl Scouts)


This Girl Scout troop is learning about worms. Judy Gibbs is a naturalist at the Hartley Nature
Center in Duluth. She shows the girls how to coax worms out of the soil. They pour water laced
with powdered mustard into the worms’ burrows.


It irritates the worms and they come squiggling up by the hundreds.


“Pour it in. Wait a minute. Here it comes. It doesn’t like the mustard and it comes right up.
Look at this one (laughter). oh, there’s another one. Look at it go!” (shrieks)


On their walk through the woods, the girls look for dead leaves. There aren’t many. Judy Gibbs
explains why.


“Here’s a leaf stem that’s being pulled into this hole. Who’s doing this? Ants! No. Worms.
There’s big night crawlers. You know what a night crawler is? They grow straight down into the
ground, and they come up at night and pull leaves down into their burrows. And they eat the leaf
right off. That’s why we’re not finding any leaves.”


Worms eating leaves might seem natural, but it turns out these worms aren’t native to these
woods. The last glacier buried most of what is now the Great Lakes region. When it melted,
plants and animals returned to create a community of maples, pines, songbirds, and tender plants
growing on the forest floor, like trillium…but not earthworms.


Cindy Hale is a biologist who studies the native wildflowers that grow in northern hardwood
forests. She loves the spring bloomers that take root in the spongy layer of decaying leaves on
the forest floor. Trillium, bloodroot, solomon’s seal.


Hale says many of these plants are disappearing.


“Sites that forty years ago were carpets of trillium have been slowly over the last two decades
declining to almost nothing, and people were scratching their heads, trying to figure out just
what’s going on.”


Earthworm populations are thickest close to cities. But Hale says people bring worms with them
when they come to the woods.


At first, settlers carried them in, along with the animals and plants they brought from Europe or
the east coast. These days, worms are spread by people who drive in the woods – loggers, ATV
riders…


“But in particular, fishing bait is a huge way that worms get moved around in our region.
Because there’s so many lakes and so much fishing.”


Hale and her colleagues set up test plots along an advancing line of worms in the Chippewa
National Forest in central Minnesota. The worms crawl about three yards further into the forest
each year. Hale is studying how the soil and the plants have changed as the worms advance.


Worms eat the decaying leaves on the forest floor. They mix that organic matter into the mineral
soil beneath it. And in time, they can use up all the organic matter and leave only mineral soil
behind.


That means the plants that have evolved to take root in the leaves on top of the soil have lost their
home.


Hale says these changes could affect every plant and animal that lives in the woods. She says,
for instance, even birds have declined by nearly 50% in the last fourteen years.


“Because ovenbirds nest in that forest floor, so if you lose the forest floor, then you may well
affect ground-nesting birds such as that. So when you start thinking about it, the potential
ramifications across the ecosystem get really wild.”


Hale says one of the big challenges in studying this problem is that there’s been very little basic
research – like how many worms are there are and where.


To gather more information and to get more people involved, Hale created a web-based learning
program. She’s asking teachers from around the country to have their classes do worm counts
and other research. Hale plans to add their data to the web page.


In Minnesota, the Department of Natural Resources is working with interest groups to try to slow
the spread of worms. Next year’s fishing regulations will include instructions not to dump your
worms at the end of a day of fishing.


For the Great Lakes Radio Consortium, I’m Stephanie Hemphill in Duluth.

Hunt for Slug-Eating Nematodes

A $5,000 reward is being offered to anyone who finds a tiny, parasitic worm in the U.S. that kills leaf-eating slugs. The gray garden slug is notorious for destroying crops and ornamental plants in the Midwest. Researchers at Ohio State University have been looking for the worm that eats the slugs. So far, they’ve examined thousands of slugs sent to them in the mail … but they haven’t been able to find the worm. The Great Lakes Radio Consortium’s Natalie Walston reports:

Transcript

A five thousand dollar reward is being offered to anyone who finds a tiny, parasitic worm in the United States that kills leaf-eating slugs. The gray garden slug is notorious for destroying crops and ornamental plants in the Midwest. Researchers at Ohio State University have been looking for the worm that eats the slugs. So far, they’ve examined thousands of slugs sent to them in the mail, but they haven’t been able to find the worm. The Great Lakes Radio Consortium’s Natalie Walston reports.


(Natural sound of guinea hens)


The Kingwood Center in Mansfield, Ohio is made up of 50 acres of well-tended English gardens. Paved trails lead through rows of perennials and peonies, around fountains and a duck pond. Hundreds of hostas grow beneath shade trees, but the plants leaves have holes chewed through them. John Makely is Kingwood’s head gardener. He says the conventional methods to kill the slugs eating his hostas are out of the question here.


“The problem that we have here with slug bait is that we do have birds roaming around, peacocks and guinea hens that roam around freely. They sort of grouse, browse I should say, the grounds and we would be afraid that they would pick up some of those pellets and poison them.”


Slug bait consists of a poison that can harm more than its intended target. But right now, it’s the only commercial method available to control slugs. So, now there’s a big push by large, commercial nurseries to find a chemical-free way to kill the gray garden slugs that eat ornamental plants. Ohio State University researcher, Pavinder Grewal says there’s a major economic reason to find a good control method.


“Last year we had a lot of rain here when the corn was emerging. And there have been several fields in Ohio that were totally wiped out by the slugs. Basically zero corn production in some fields.”


Grewal has found a natural slug killer. It’s a tiny parasitic worm, known as a nematode. It is native to England and parts of several countries in South America. Farmers and gardeners in those countries buy them in bulk in powder form and sprinkle the worms on their fields. Scientists think the worm will work in this country as well. But if the worm is imported, it must first undergo years of testing to make sure it will not harm native plants and animals.


“We don’t see any problem because some of the tests that we have performed with the nematode…we find it to be pretty safe to non-target organisms. And, we find that this nematode does not infect all slugs.”


To prove this to the federal government could be difficult. Grewal is looking for the worm, in the United States he took out an ad in various publications. He studies more than twenty thousand slugs, but has yet to find the worm he’s looking for. Now he’s sending people off to remote areas of the country to find it. He hopes to be successful because it could take years of testing before the worms can be brought into this country. For the Great Lakes Radio Consortium, I’m Natalie Walston.

Global Worming

Remember when you were a kid, how you’d spend hours poking around,
looking for creepy crawly things? If one woman has her way, a lot more
of us will rediscover that joy…And as adults, also appreciate some
practical benefits. The Great Lakes Radio Consortium’s Wendy Nelson
explains:

Worm Dispensing Machines?

When vending machines were first introduced, they mostly dispensed
coffee, soft drinks, and cellophane-wrapped sandwiches. But today, some
vending machines are offering up a very different kind of grub; they
dispense fishing bait. It’s a growing trend in vending. There are now
about two-thousand bait machines across the country, with the largest
concentration in Michigan, Ohio, and New York. The Great Lakes Radio
Consortium’s Wendy Nelson reports:

Global Worming

Remember when you were a kid, how you’d spend hours sitting in the yard,poking around, looking for creepy crawly things? If one woman has herway, a lot more of us will rediscover that joy…And as adults, alsoappreciate some practical benefits. The Great Lakes Radio Consortium’sWendy Nelson explains: