Beekeepers in the Midwest and elsewhere are turning to innovative ways to protect their hives from tiny, blood-sucking mites. As the Great Lakes Radio Consortium’s Sarah Hulett reports, farmers depend on the health of commercial honeybee colonies:
Transcript
Beekeepers in the Midwest and elsewhere are turning to innovative ways to protect their hives
from tiny, blood-sucking mites. As the Great Lakes Radio Consortium’s Sarah Hulett reports,
farmers depend on the health of commercial honeybee colonies:
Apples, cherries, and cucumbers are among the crops that depend on bees for pollination. But in
the mid-80’s, a parasite called varroa wiped out wild honeybees in the U.S. And the mites have
also taken a toll on commercial colonies as well.
The problem is especially serious in California. Almond growers there have had difficulties in
the last few years getting enough bees to pollinate their half-million acres of almond trees. But
Zachary Huang, a honeybee researcher at Michigan State University, says beekeepers in the
region still have about twice the number of bees needed to meet farmers’ demands.
“It’s not so bad yet that we’re having trouble getting bees to pollinate our fruit trees.”
Chemicals have been developed to kill the mites. But so far, they’ve proved only partly effective,
or the mites become resistant. Huang has patented a device called the “mite zapper” that kills the
parasites in the hives. He hopes to be able to market it to beekeepers next year.
For the Great Lakes Radio Consortium, I’m Sarah Hulett.
Plants and animals that come from overseas sometimes out-compete species that are native to the region. Scientists have long debated what makes the invaders so successful. One hypothesis is that invasive species have fewer natural enemies. New research supports this idea. The Great Lakes Radio Consortium’s Rebecca Williams has details:
Transcript
Plants and animals that come from overseas sometimes out-compete species that are native to the
region. Scientists have long debated what makes the invaders so successful. One hypothesis is
that invasive species have fewer natural enemies. New research supports this idea. The Great
Lakes Radio Consortium’s Rebecca Williams has details:
Invasive animals and plants have fewer parasites and diseases than their native competitors.
That’s according to two new studies published in the journal Nature. In one study, researchers
analyzed parasites of 26 invasive species, including the zebra mussel.
Kevin Lafferty is an author of the study. He says when a foreign species invades a new area, it
leaves most of its parasites behind. He says importing those natural enemies might be a good
way to control invasives.
“There’s still several species, on average, about 13 parasite species back in the introduced
species’ home range, that we could consider for biological control, and of course an important
part of that process is to determine which ones might be safe, in terms of not infecting our native
species.”
A second study looked at nearly 500 plants that have been brought into the U.S. Researchers
found that plants that leave behind the most pathogens are the most likely to become invasive.
For the Great Lakes Radio Consortium, I’m Rebecca Williams.
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.
Sea lampreys feed on a lake trout. The invasive species damages the Great Lakes fishery. (photo courtesy Great Lakes Fishery Commission)
A new effort to eradicate the sea lamprey is attacking one major
trouble spot. The Great Lakes Radio Consortium’s Lester Graham
reports… the parasite is being trapped and poisoned:
The ability to sue, if your community provides unhealthy drinking water
is back before the courts. Some who say they were harmed by a parasite
in Milwaukee’s water supply in 1993 are pressing ahead with a lawsuit
against that city. But the case faces a major hurdle this month. The
Great Lakes Radio Consortium’s Chuck Quirmbach explains:
Its estimated that the U.S. honeybee industry generates about $8
million in annual revenue. But the industry has taken a serious
financial hit from a mite infestation. Honey bees are being killed and
honey production is down. You might think that would mean higher
prices for honey. But as the Great Lakes Radio Consortium’s Lester
Graham reports, the price of honey has actually gone down:
Honeybees pollinate crops, flowers, and wild plants, but now the
U.S. honeybee industry is in trouble because of a mite infestation. The
Great Lakes Radio Consortium’s Lester Graham reports that a quick solution
isn’t likely, because there’s no profit in finding new chemicals to get
rid of the mites:
