Mystery Malady Kills More Bees, Heightening Worry on Farms
Jim Wilson/The New York Times
A Disastrous Year for Bees:
For America’s beekeepers, who have struggled for nearly a decade with a
mysterious malady called colony collapse disorder that kills honeybees
en masse, the last year was particularly bad.
By MICHAEL WINES
Published: March 28, 2013
BAKERSFIELD, Calif. — A mysterious malady that has been killing honeybees en masse for several years appears to have expanded drastically in the last year, commercial beekeepers say, wiping out 40 percent or even 50 percent of the hives needed to pollinate many of the nation’s fruits and vegetables.
BAKERSFIELD, Calif. — A mysterious malady that has been killing honeybees en masse for several years appears to have expanded drastically in the last year, commercial beekeepers say, wiping out 40 percent or even 50 percent of the hives needed to pollinate many of the nation’s fruits and vegetables.
Jim Wilson/The New York Times
Beekeepers with Big Sky Honey worked with hives used
to pollinate almond groves in Bakersfield, Calif.
A conclusive explanation so far has escaped scientists studying the
ailment, colony collapse disorder, since it first surfaced around 2005.
But beekeepers and some researchers say there is growing evidence that a
powerful new class of pesticides known as neonicotinoids, incorporated
into the plants themselves, could be an important factor.
The pesticide industry disputes that. But its representatives also say
they are open to further studies to clarify what, if anything, is
happening.
“They looked so healthy last spring,” said Bill Dahle, 50, who owns Big
Sky Honey in Fairview, Mont. “We were so proud of them. Then, about the
first of September, they started to fall on their face, to die like
crazy. We’ve been doing this 30 years, and we’ve never experienced this
kind of loss before.”
In a show of concern, the Environmental Protection Agency recently sent
its acting assistant administrator for chemical safety and two top
chemical experts here, to the San Joaquin Valley of California, for
discussions.
In the valley, where 1.6 million hives of bees just finished pollinating
an endless expanse of almond groves, commercial beekeepers who only
recently were losing a third of their bees to the disorder say the past
year has brought far greater losses.
The federal Agriculture Department is to issue its own assessment in
May. But in an interview, the research leader at its Beltsville, Md.,
bee research laboratory, Jeff Pettis, said he was confident that the
death rate would be “much higher than it’s ever been.”
Following a now-familiar pattern, bee deaths rose swiftly last autumn
and dwindled as operators moved colonies to faraway farms for the
pollination season. Beekeepers say the latest string of deaths has dealt
them a heavy blow.
Bret Adee, who is an owner, with his father and brother, of Adee Honey
Farms of South Dakota, the nation’s largest beekeeper, described
mounting losses.
“We lost 42 percent over the winter. But by the time we came around to
pollinate almonds, it was a 55 percent loss,” he said in an interview
here this week.
“They looked beautiful in October,” Mr. Adee said, “and in December, they started falling apart, when it got cold.”
Mr. Dahle said he had planned to bring 13,000 beehives from Montana — 31
tractor-trailers full — to work the California almond groves. But by
the start of pollination last month, only 3,000 healthy hives remained.
Annual bee losses of 5 percent to 10 percent once were the norm for
beekeepers. But after colony collapse disorder surfaced around 2005, the
losses approached one-third of all bees, despite beekeepers’ best
efforts to ensure their health.
Nor is the impact limited to beekeepers. The Agriculture Department says
a quarter of the American diet, from apples to cherries to watermelons
to onions, depends on pollination by honeybees. Fewer bees means smaller
harvests and higher food prices.
Almonds are a bellwether. Eighty percent of the nation’s almonds grow
here, and 80 percent of those are exported, a multibillion-dollar crop
crucial to California agriculture. Pollinating up to 800,000 acres, with
at least two hives per acre, takes as many as two-thirds of all
commercial hives.
This past winter’s die-off sent growers scrambling for enough hives to
guarantee a harvest. Chris Moore, a beekeeper in Kountze, Tex., said he
had planned to skip the groves after sickness killed 40 percent of his
bees and left survivors weakened.
“But California was short, and I got a call in the middle of February
that they were desperate for just about anything,” he said. So he sent
two truckloads of hives that he normally would not have put to work.
Bee shortages pushed the cost to farmers of renting bees to $200 per
hive at times, 20 percent above normal. That, too, may translate into
higher prices for food.
Precisely why last year’s deaths were so great is unclear. Some blame
drought in the Midwest, though Mr. Dahle lost nearly 80 percent of his
bees despite excellent summer conditions. Others cite bee mites that
have become increasingly resistant to pesticides. Still others blame
viruses. Jim Wilson/The New York Times Bees on a honeycomb pulled from a hive at Big Sky Honey.
Jim Wilson/The New York Times
Bill Dahle, the owner, described a startling loss of honeybees last year.
But many beekeepers suspect the biggest culprit is the growing soup of
pesticides, fungicides and herbicides that are used to control pests.
While each substance has been certified, there has been less study of
their combined effects. Nor, many critics say, have scientists
sufficiently studied the impact of neonicotinoids, the nicotine-derived
pesticide that European regulators implicate in bee deaths.
The explosive growth of neonicotinoids since 2005 has roughly tracked rising bee deaths.
Neonics, as farmers call them, are applied in smaller doses than older
pesticides. They are systemic pesticides, often embedded in seeds so
that the plant itself carries the chemical that kills insects that feed
on it.
Older pesticides could kill bees and other beneficial insects. But while
they quickly degraded — often in a matter of days — neonicotinoids
persist for weeks and even months. Beekeepers worry that bees carry a
summer’s worth of contaminated pollen to hives, where ensuing
generations dine on a steady dose of pesticide that, eaten once or
twice, might not be dangerous.
“Soybean fields or canola fields or sunflower fields, they all have this
systemic insecticide,” Mr. Adee said. “If you have one shot of whiskey
on Thanksgiving and one on the Fourth of July, it’s not going to make
any difference. But if you have whiskey every night, 365 days a year,
your liver’s gone. It’s the same thing.”
Research to date on neonicotinoids “supports the notion that the
products are safe and are not contributing in any measurable way to
pollinator health concerns,” the president of CropLife America, Jay
Vroom, said Wednesday. The group represents more than 90 pesticide
producers.
He said the group nevertheless supported further research. “We stand
with science and will let science take the regulation of our products in
whatever direction science will guide it,” Mr. Vroom said.
A coalition of beekeepers and environmental and consumer groups sued the
E.P.A. last week, saying it exceeded its authority by conditionally
approving some neonicotinoids. The agency has begun an accelerated
review of their impact on bees and other wildlife.
The European Union has proposed to ban their use on crops frequented by
bees. Some researchers have concluded that neonicotinoids caused
extensive die-offs in Germany and France.
Neonicotinoids are hardly the beekeepers’ only concern. Herbicide use
has grown as farmers have adopted crop varieties, from corn to
sunflowers, that are genetically modified to survive spraying with
weedkillers. Experts say some fungicides have been laced with regulators
that keep insects from maturing, a problem some beekeepers have
reported.
Eric Mussen, an apiculturist at the University of California, Davis,
said analysts had documented about 150 chemical residues in pollen and
wax gathered from beehives.
“Where do you start?” Dr. Mussen said. “When you have all these
chemicals at a sublethal level, how do they react with each other? What
are the consequences?”
Experts say nobody knows. But Mr. Adee, who said he had long scorned
environmentalists’ hand-wringing about such issues, said he was starting
to wonder whether they had a point.
Of the “environmentalist” label, Mr. Adee said: “I would have been
insulted if you had called me that a few years ago. But what you would
have called extreme — a light comes on, and you think, ‘These guys
really have something. Maybe they were just ahead of the bell curve.’”
