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

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.”

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3 Responses

  1. Imidicloprid is an innovative and versatile pesticide. I prefer that it is restricted during flowering rather than banned altogether. Moreover, it is not a matter of one active ingredient alone, but of systemic insecticides in general, and neonicotinoids in particular. We cannot succeed with transgenic crops such as Bt cotton bereft of such pesticides. However, they should be used for seed treatment and for foliar applications during the vegetative phase of plant growth.

  2. 2
    Fact Sheet on “Merit” insecticide (grub killer)
    (active ingredient: Imidacloprid)
    (Instead of using Merit please consider using natural Nematodes, which eat grubs! and Mole Crickets!


    - Imidacloprid is the active ingredient used in the grub killing pesticide named “Merit”
    (Merit and Bayer are trademarks of Bayer CropScience)

    - imidacloprid is a chlorinated nicotinoid compound, that affects the nervous system

    - Imidacloprid is manufactured by Bayer

    - Imidacloprid is banned in Italy, Germany, Slovenia, and restricted in France (see: source).

    - Imidacloprid works by fitting into nerve receptors meant to receive the neurotransmitter acetylcholine (ACh). By blocking these acetylcholine receptors, an excess of acetylcholine accumulates causing paralysis and eventual death

    - Adverse effects of imidacloprid may include apathy, difficulty breathing, loss of the ability to move, staggering, trembling and spasms[1]

    - The thyroid is particularly sensitive to exposure of imidacloprid, which is linked to causing thyroid lesions.[2]

    - Imidacloprid is very toxic to earth worms,[3] with an LD50 of between 2 and 4 parts per million in soil

    - Imidacloprid is extremely toxic to honey bees [see product label example] and is restricted in France because of plummeting bee populations.

    - Imidacloprid kills parasitic wasps that control grub larvae. This is counter-productive, setting the stage for repeated, more extensive grub infestations.

    - Imidacloprid is applied to seeds because it acts as a bird repellent. Birds such as starlings and robins eat very large numbers of grubs. Repelling this important natural control would be counter-productive.

    - Imidacloprid use has been linked to eggshell thinning in birds.[4]

    - Imidacloprid is highly toxic to certain species including the house sparrow,[5] pigeon, canary and Japanese quail[6]

    - Imidacloprid severely limits the mobility of lady beetles[7] and other predatory insects such as marid bugs and lacewings.[8]

    - At exposures of 0.2 ppm, imidacloprid has been shown to cause deformed sperm and 0.5 ppm for DNA damage[9].

    - When imidacloprid was fed to pregnant rabbits between the sixth and eighteenth days of pregnancy, there was an increase in the number of miscarriages and an increase in the number of offspring with abnormal skeletons.[10] Imidacloprid-exposed rats also gave birth to smaller offspring.

    - The label stipulates that food crops cannot be planted for a year after imidacloprid application. Thus, two growing seasons would have elapsed before harvest. Our children are not afforded the protection of two growing seasons before exposure to turf that has been treated with imidacloprid.

    - Breakdown of imidacloprid in the environment is very complex and slow, and some degradation products are more toxic than the parent compound. Thus, the possibility exists that soil will become more toxic rather than less toxic with the passage of time. This may not happen if sufficient pesticide was washed away, but pollution of our water is not a desirable outcome either.

    - Compared with 11 other popular pesticides, imidacloprid moved more quickly through soil than any of the other pesticides tested.[11] The EPA places imidacloprid in category I as having the highest leaching potential.

    - There is a potential for the compound to move through sensitive soil types including porous, gravelly, or cobbly soils, depending on irrigation practices [12]

    - The New York State (Cornell report) is concerned that imidacloprid is found in an “increasing number of detections in private homeowner wells” — click here to view

    - Imidacloprid is extremely long-lasting. It has a half-life up to 730 days, yet is approved for annual applications. It has been observed to build up over the years, in agricultural application.

    - Constant exposure to pesticides fosters pesticide resistance. Resistance to imidacloprid has appeared within as little as 2 years. Insecticides should be reserved for when they are badly needed to protect public health.

    - Inert ingredients / contaminants of the imidacloprid product “Merit” have been reported to include naphthalene and crystalline silica. Both napthalene and crystalline silica are proven cancer causing agents [13],[14]

    - Imidacloprid degrades into toxic, persistent, 2-chloropyridine. This was not considered in the federal assessment.

    - Historically, imidacloprid was granted at least three temporary registrations by the PMRA, in spite of missing environmental fate data.

    - Commissioner for the Environment, Johanne Gélinas, has repeatedly criticised the Pest Management Regulatory Agency (PMRA) for granting temporary registrations when important data is lacking.

    - As of June 12, 2007, the PMRA as registered four commercial insecticides containing Imidacloprid:

    Merit Solupack Insecticide (Reg. No. 25932)

    Merit 0.5 G insecticide (Reg. No. 25933),



    The PMRA still does not have complete environmental fate data.

    In 2003, 527 kg of imidacloprid was used for agriculture purposes in Ontario, while in Ottawa 776 kg of insecticides including imidacloprid and sevin was used on turf. Public statements from lawn pesticide applicators indicated that they mainly apply imidacloprid. It would therefore appear that the largest use of imidacloprid in Ontario is for turf.

    For additional studies on imidacloprid, please click here (Fact Sheet with 18 references).

    Recent News:

    - On August 25, 2008, The Coalition against Bayer Dangers initiated a lawsuit against Werner Wenning, chairman of the Bayer AG Board of Management, and Bayer CropScience for “marketing dangerous pesticides and thereby accepting the mass death of bees all over the world.” The alleged dangerous Bayer pesticides are imidacloprid (used in “Merit”) and clothianidin. Both are “neonicotinoid” insecticides. Harro Schultze, attorney of the Coalition against Bayer Dangers, said “we’re suspecting that Bayer submitted flawed studies to play down the risks of pesticide residues in treated plants” For more info, please see: The Coalition against Bayer Dangers, News item 1, News item 2 and PMRA’s 2004 assessment of Clothianidin – which on page 30 found studies “to be deficient in design and conduct“.

    - August 2008, The Natural Resources Defense Council filed a lawsuit seeking the release of U.S. Environmental Protection Agency (EPA) test data for Bayer’s neonicotinoid pesticides (imidacloprid and clothianidin). For details,

  3. I don’t have the label in front of me at the moment but I am pretty sure it warns against treating plants when being visited by bees. This is the least of our problems, as the stuff kills white grubs and Borers, every home owner with anything green in the yard is bunging this stuff around whether or not the tree has Borers or the lawn grubs. We are bound to loose an effective weapon against such pests as Hemlock Woolly Adelgid because of over and misuse. Pity.

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