Tag-Archive for » Eric Mussen «

Sunday, May 24th, 2009 | Author:

Pesticides indicted in bee deaths

Agriculture officials have renewed their scrutiny of the world’s best-selling pest-killer as they try to solve the mysterious collapse of the nation’s hives.

By Julia Scott
Salon.com
http://www.salon.com/env/feature/2009/05/18/bees_pesticides/

May 18, 2009 – Gene Brandi will always rue the summer of 2007. That’s when the California beekeeper rented half his honeybees, or 1,000 hives, to a watermelon farmer in the San Joaquin Valley at pollination time. The following winter, 50 percent of Brandi’s bees were dead.Graphic: Fate of Imidacloprid “They pretty much disappeared,” says Brandi, who’s been keeping bees for 35 years.Since the advent in 2006 of colony collapse disorder, the mysterious ailment that continues to decimate hives across the country, Brandi has grown accustomed to seeing up to 40 percent of his bees vanish each year, simply leave the hive in search of food and never come back. But this was different. Instead of losing bees from all his colonies, Brandi watched the ones that skipped watermelon duty continue to thrive.

Brandi discovered the watermelon farmer had irrigated his plants with imidacloprid, the world’s best-selling insecticide created by Bayer CropScience Inc., one of the world’s leading producers of pesticides and genetically modified vegetable seeds, with annual sales of $8.6 billion. Blended with water and applied to the soil, imidacloprid creates a moist mixture the bees likely drank from on a hot day.

Stories like Brandi’s have become so common that the National Honeybee Advisory Board, which represents the two biggest beekeeper associations in the U.S., recently asked the U.S. Environmental Protection Agency to ban the product. “We believe imidacloprid kills bees — specifically, that it causes bee colonies to collapse,” says Clint Walker, co-chairman of the board.

Beekeepers have singled out imidacloprid and its chemical cousin clothianidin, also produced by Bayer CropScience, as a cause of bee die-offs around the world for over a decade. More recently, the same products have been blamed by American beekeepers, who claim the product is a cause of colony collapse disorder, which has cost many commercial U.S. beekeepers at least a third of their bees since 2006, and threatens the reliability of the world’s food supply.

Scientists have started to turn their attention to both products, which are receiving new scrutiny in the U.S., due to a disclosure in December 2007 by Bayer CropScience itself. Bayer scientists found imidacloprid in the nectar and pollen of flowering trees and shrubs at concentrations high enough to kill a honeybee in minutes. The disclosure recently set in motion product reviews by the California Department of Pesticide Regulation and the EPA. The tests are scheduled to wrap up in 2014, though environmentalists, including the Sierra Club, are petitioning the EPA to speed up the work.

For over a decade, Bayer CropScience has been forced to defend the family of insecticides against calls for a ban by beekeepers and environmentalists. French beekeepers succeeded in having imidacloprid banned for use on several crops after a third of the country’s bees died following its use in 1999 — although the French bee population never quite rebounded, as Bayer is quick to point out. Germany banned the use of clothianidin and seven other insecticides in 2008 after tests implicated them in killing up to 60 percent of honeybees in southwest Germany.

Imidacloprid and clothianidin are chloronicotinoids, a synthetic compound that combines nicotine, a powerful toxin, with chlorine to attack an insect’s nervous system. The chemical is applied to the seed of a plant, added to soil, or sprayed on a crop and spreads to every corner of the plant’s tissue, killing the pests that feed on it.Pennsylvania beekeeper John Macdonald has been keeping bees for over 30 years and recently became convinced that imidacloprid is linked to colony collapse disorder. It’s the only explanation he can find for why his bees, whose hives border farmland that uses the pesticide, started dropping dead a few years ago.

“There’s the pernicious toxic effect — it does everything nicotine does to our nervous system,” says Macdonald. “There’s the pathological effect, the interference with basic functions. They get lost, they get disoriented. They fall to the ground. They get paralyzed and their wings stick out. I can’t think of anything in the environment that’s changed other than farming, and virtually every farmer is using treated seeds now.”

Bayer CropScience spokesman Jack Boyne says his company’s pesticides are not to blame. “We do a lot of research on our products and we feel like we have a very good body of evidence to suggest that pesticides, including insecticides, are not the cause of colony collapse disorder,” he says. “Pesticides have been around for a lot of years now and honeybee collapse has only been a factor for the last few years.” (Imidacloprid has been approved for use in the U.S. since 1994 and clothianidin has been used since 2003.)

Scientists continue to investigate the causes of colony collapse disorder. Leading theories suggest a combination of factors that include parasitic mites, disease, malnutrition and environmental contaminants like pesticides, insecticides and fungicides. The current EPA review will provide further insight into the role of pesticides, as it will uncover whether honeybees sickened by exposure to imidacloprid spread it around by bringing contaminated nectar and pollen back to the hive.

EPA critics suggest that the agency allowed economic considerations to take precedence over the well-being of honeybees when it approved imidacloprid for sale in the U.S. 15 years ago. “I think the EPA and USDA [U.S. Department of Agriculture] have been covering up for Bayer, and now they’re scrambling to do something about it,” says Neil Carman, a plant biologist who advises the Sierra Club on pesticides and other issues. “This review should have been done 10 years ago. It’s been found to be more persistent in the environment than was reported by Bayer.”

Imidacloprid was approved with knowledge that the product, marketed as Gaucho, Confidor, Admire and others, was lethal to honeybees under certain circumstances. Today the EPA’s own literature calls it “very highly toxic” to honeybees and other beneficial insects. Its workaround was to slap a label on the product, warning farmers not to spray it on a plant when bees were foraging in the neighborhood.

In its 2007 studies, Bayer applied standard doses of imidacloprid to test trees, including apple, lime and dogwood. Its scientists found imidacloprid in nectar at concentrations of up to 4,000 parts per billion, a dose high enough to kill several bees at once. (Honeybees can withstand a dose of up to 185 ppb, the standard amount it would take to kill 50 percent of a test population.) What caught the attention of California agricultural officials was that the test trees contained the same amount of deadly imidacloprid as the citrus and almond groves regularly sprayed by farmers, and pollinated by bees. (California’s almond industry has increased its use of imidacloprid by a factor of 300 in the past five years.) Agricultural officials were also surprised to learn that the imidacloprid can persist in the leaves and blossoms of a plant for more than a year.

The Bayer results don’t surprise University of California at Davis professor Eric Mussen, a well-known entomologist and one of the country’s leading experts on colony collapse disorder. Mussen has seen a variety of unpublished studies with similar results, including one at U.C. Riverside that found imidacloprid in the nectar of a eucalyptus tree bloom at concentrations of 550 ppb a full year after it was applied.

“From some of the data on the trees, it appears as though there are situations where honeybees can get into truly toxic doses of the material,” says Mussen, who avoids spraying imidacloprid on his own demonstration fields at U.C. Davis. “This the first time that we’ve had something you put in a tree that could stay there for a long time.”

But Mussen isn’t convinced imidacloprid is a primary cause of the honeybee die-off. He explains that some bees settle on fields of sunflowers and canola treated with the chemical and then “fly right through to next year.” So imidacloprid is not the only story. “Could it be part of the story?” he asks. “I’m sure. I think any of the pesticides the bees bring back to the beehive is hurting the bees.”

Mussen adds that ongoing research into chronic exposure to insecticides will be crucial. It’s likely, he says, that exposure to even low doses acts like a one-two punch: It can weaken the bees until a parasite or pathogen moves in to finish them off.

As the EPA begins its pesticide studies this year, skeptics wonder whether the agency can conduct an unbiased review. Back in 2003, they point out, the EPA reported that clothianidin was “highly toxic to honeybees on an acute contact basis,” and suggested that chronic exposure could lead to effects on the larvae and reproductive effects on the queen. Although the EPA asked Bayer for further studies of its effects on honeybees, it nevertheless authorized the chemical for market.

“If the EPA had sufficient concern about harm to bees that they would insist on other studies, it seemed unwise to approve it anyway and ask for research after the fact,” says Aaron Colangelo, an attorney with the Natural Resources Defense Council. “The EPA’s job is to make a decision about whether a chemical is safe or not.”

Colangelo envisions a similar scenario in coming years. The EPA has announced it will review clothianidin and other chemicals in the same family, but not until 2012. In the meantime, there’s nothing stopping the agency from approving the insecticides for use on new crops based on existing policies. In the end, Colangelo has little confidence the federal agency will bring a hammer down on the agribusiness giant. The EPA, he explains, often keeps its test results confidential for proprietary reasons at a company’s request. As a consequence, it’s unclear where gaps or discrepancies occur until a company makes a disclosure similar to Bayer’s.

“They’re not making decisions about whether the pesticide can be put on the market based on impacts to bees, no matter how much evidence of harm there is,” Colangelo says. “The EPA will just approve it anyway and put a warning label on the product.”

Halting the sale of pesticides, though, would be no mean task. Over 120 countries use imidacloprid under the Bayer label on more than 140 crop varieties, as well as on termites, flea collars and home garden landscaping. And the product’s patent expired a few years ago, paving the way for it to be sold as a generic insecticide by dozens of smaller corporations. In California alone, imidacloprid is the central ingredient in 247 separate products sold by 50 different companies.

In a statement, the EPA says that before banning a pesticide, it “must find that an ‘imminent hazard’ exists. The federal courts have ruled that to make this finding, EPA must conclude, among other things, that there is a substantial likelihood that imminent, serious harm will be experienced from use of the pesticide.” The EPA did not clarify what is meant by “imminent hazard” and why the death of honeybees does not qualify.

As Mussen points out, though, a few million dead honeybees may be the cost of doing business. “If they didn’t register products that were toxic to honeybees, there wouldn’t be a lot of products on the market that were available for pest control.”

All the more reason to start taking the world’s most ubiquitous insecticide off the market and invent a safer one, argues Walker, of the National Honeybee Advisory Board. “It’s on every golf course, it’s on every lawn. It’s not just an agricultural product. There’s really not one part of our lives it’s not touching.”

Tuesday, April 14th, 2009 | Author:

ABSTRACT

Honeybee colony collapse is a sanitary and ecological worldwide problem. The features of this syndrome are an unexplained disappearance of adult bees, a lack of brood attention, reduced colony strength, and heavy winter mortality without any previous evident pathological disturbances. To date there has not been a consensus about its origins. This report describes the clinical features of two professional bee-keepers affecting by this syndrome. Anamnesis, clinical examination and analyses support that the depopulation in both cases was due to the infection by Nosema ceranae (Microsporidia), an emerging pathogen of Apis mellifera. No other significant pathogens or pesticides (neonicotinoids) were detected and the bees had not been foraging in corn or sunflower crops. The treatment with fumagillin avoided the loss of surviving weak colonies. This is the first case report of honeybee colony collapse due to N. ceranae in professional apiaries in field conditions reported worldwide.

E-mail mhiges@jccm.es; Tel. (+34) 949 25 00 26; Fax (+34) 949 25 01 76.

MY NOTES: Some beekeepers don’t recommend using it, affects cold weather bees. http://www.beesource.com/forums/archive/index.php/t-225700.html

And there’s discussions about how to apply it: http://www.beesource.com/forums/showthread.php?p=42097o None the less, it should be noted for the record.

Plus, Dr. Eric Mussen, UC Davis, chimes in about it http://www.projectapism.org/content/view/13/27/

And, is Nosema locustae “the only protozoan registered as a pesticide active ingredient” and what research has been done with honey bees and Nosema locustae? “Nosema locustae is a naturally-occurring microbe that infects and kills grasshoppers and Mormon crickets when these pests ingest bait that contains Nosema

 

Fumagillin in Environmental Microbiology Reports

Sunday, March 15th, 2009 | Author:
So interesting to see how the conversation about CCD has evolved in the press. This article is a keeper, full of instructive detail, copied here for posterity.- DNR

Mysterious Bee Deaths Strike Central Valley

http://www.valleyvoicenewspaper.com/vvarc/2007/february212007.htm

By Steve Pastis

February 21, 2007 – San Joaquin Valley – A mysterious ailment is killing off bees in Tulare County and across the country. Given the name “Colony Collapse Disorder,” the new disease has wiped out bee colonies in 21 states so far.

The loss of bees in the Central Valley is expected to have a negative impact on crops such as avocados, cherries, plums, alfalfa seeds, pomegranates and kiwi. The bee shortage may hit almonds the hardest during the time of year when half of the country’s commercial bees are brought into the state to help launch what should become a $1.4 billion dollar harvest. Even more bees will be needed over the next few years as California almond production is expected to expand to more than 750,000 acres by the year 2010.

“I’ve lost over 2,000 bees over the last two months,” said David Bradshaw, owner of Bradshaw Honey Farms in Visalia. He had about 4,200 bees but is now down to less than 2,000.

Recently, he was visited by research teams from Pennsylvania State University and the University of Montana. The teams took samples to study and dissect more…

Monday, March 17th, 2008 | Author:

I borrowed my friend’s vegcar to drive up to Santa Rosa, CA last weekend to learn about the CCD situation and meet more local beekeepers at the 2008 Bee Symposium. Quite a niceRandy Oliver at 2008 Bee Symposium, Sebastapol, CA turnout at the Summerfield Waldorf School, and I learned some great bits about dusting for mites with powdered sugar and using a microscope to look for Nosema ceranae from Randy Oliver (scientificbeekeeping dot com). The nice couple from Bee Kind store sponsored the event…. symposium@beekind.com

I have some recordings, and photos. The most interesting presentation that I wished I had recorded entirely was Dr. Ron Fessenden’s 20 minute powerpoint about honey and health, and the first Int’l Honey and Human Health symposium that happened in January 2008. It was fantastic! Click play below for some video from his presentation (shot with Canon Powershot SD1000).

 

I commented publicly on my observation that most of the attendees were more experienced, and/or older folks and thought that there may be a connection between the disheartening graph presented by Serge Labesque, and the fact that not many younger beekeepers were present (I counted 5 including myself). The response from Michael Thiele and others was “it’s always been that way” and “even in Germany and other Chart of beekeeper decline? parts of the world.” Obviously, according to the graph. My intention is to inspire more “kids” to understand pollination and beekeeping. It’s probably more heroic work, than, say… well, need I say? I encourage potential beekeeper mentors to recruit, get involved with leadership programs to integrate your work to find and plant the beeky seeds in our youth. Gold stars for all who get a kid away from “Play”stations and Second “Life” and turn them on to saving the planet for real!

Many San Francisco beekeepers were there, who I met later in the week at my first beekeeping club meeting. I’ve gained a mentor, and have found a place to put my hives when my bees come in April. We’ve formed a subcommittee within SFBA to examine and understand the apple moth arial spraying slated for the city of San Francisco August 1, 2008. Arial spraying for pests seems to me to be a rather Soviet-era way to handle a bug, militaristic and ineffective, and devastatingly ignorant. There is a campaign to stop this insanity.

As far as CCD goes, Mussen reported that it appears the same or worse than last year. The Vanishing of the Bees crew blogged of a well-known beek bringing them to see his dead-out hives, bee “graveyard” – millions of bees.

-DNR, March 16, 2008


BEE SYMPOSIUM 2008
THE HONEYBEE, Pollinators AND THE ENVIRONMENT

DATE: Saturday, March 8, 2008
TIME: 9:00 am ? 6:00 pm

In this time of global ecological challenges, the honeybee is an indicator species reflecting the enormous changes taking place in our world. Bee populations are dying and pollination ecology is deeply affected. As beekeepers, we must become stewards of the earth and change paradigms. This one-day symposium offers information and speakers with new perspectives on honeybees and native pollinators, beekeeping practices, innovative approaches and ecological strategies for beekeepers.Randy Oliver on microscope

THE DAY FEATURES:

  • Randy Oliver, Grass Valley, Biologist and forward thinking commercial beekeeper
  • Dr. Eric Mussen, Entomologist, UC Davis, CA Beekeeper Association 2006 Beekeeper of the Year
  • Katharina Ullmann, Presenting for Claire Kremnen, Xerces Society, UC Berkeley
  • Serge Labesque, 2006 Western Apiculturist Society’s (WAS) Innovator of the year
  • Kathy Kellison, Executive Director of Partners For Sustainable Pollination (PFSP)
  • Michael Thiele, Holistic beekeeper; Demeter Beekeeping Standards
  • Ron Fessenden, M.D. Co-Chairman of The Committee on Honey and Human Health

Serge Labesque presentation

PANEL DISCUSSION AND ALSO:

Two Innovative Movies on Beekeeping presented by the filmmakers

1) Pollen Nation, by Singeli Agnew and Joshua Fischer

2) The Vanishing of the Bees, by Maryam Henein

Doreen Schmid, presenting bee art The Melissa Garden ? A honey bee sanctuary in Healdsburg Rudolf Steiner College, Sonoma County Master Gardeners, 4-H Kids, Sonoma County Beekeeping Association and more.

Natural looking Hive (from Germany)