(Excerpt)“This is the time of year when bees should just be taking off,” says Christian Krupke, a Purdue University entomologist. Krupke believes NNIs have had a serious impact on bee health. “They should be doing fantastically well. To see hundreds of dead ones is not only strange it’s very…it’s the canary in the coal mine, so to speak. It’s a real warning that something is very wrong.”
And regulators still don’t have all the answers about clothianidin.
Bayer submitted a study on the long-term effects of clothianidin on bees as part of the pesticide approval process in the mid 2000s.
Cynthia Scott-Dupree, a University of Guelph professor, was hired by Bayer to conduct a test as part of the approval process for the chemical. In her research, she set hives out in canola fields, some of which were treated with clothianidin. The results showed no long-term effect on bees from exposure to clothianidin on seed-treated canola.
Read more: EU bans pesticides in effort to save bees
But now both Health Canada and the United States Environmental Protection Agency (EPA) have asked the company to redo the study.
“I can’t understand why they would do that,” Scott-Dupree says. “Pressure – public pressure.”
Health Canada says it considers many of the findings of the study invalid “because of irregularities in how it was conducted.”
The agency says control- and test-hives were placed too close together, resulting in contamination of the controls.
Krupke agrees. “I would say if that’s the study that is used for the basis of registration…it would be insufficient.”
Health Canada has given Bayer until the end of 2015 to submit new research. By that time, the chemical will have been in use for more than a decade without a full understanding of its effects on bees
And now, critics say the new science Bayer is expected to submit may also be flawed. The company hired Scott-Dupree again to conduct a $950,000 study. She says this study is improved from the one deemed faulty by Health Canada and the EPA.
“The first time we did it in 2005 there was some concerns about some of the results,” Scott-Dupree says. “So…we did it again and we tried to improve on all of the factors that were of concern the first time.”
Though her second study has not yet been submitted to regulators, she says the results are similar to what she found in her first experiment.
“We haven’t seen anything different than we did in the past. We’re not seeing massive colony losses.”
But Krupke says the design of the new study is “outdated, simplistic and uninformative.”
He says one of the problems is that Scott-Dupree did not start with hives and bees that were clean – with no exposure to pesticides before the experiment started.
“If the hives aren’t clean, then everything is confounded. Then you don’t know what you’re going in with,” said Krupke. “You don’t have baseline data. How healthy were those hives? How stressed? How contaminated, if at all.”
“They were strong colonies. They produced a lot of honey the year before,” Scott-Dupree says. “They were choice colonies for this particular study. They all went into the study of equal strength.”
Other prominent scientists echo Krupke’s concerns.
Dave Goulson, a British bee expert, says pre-exposure to other chemicals “could add considerable noise to the data set, potentially obscuring any treatment effect.”
In a letter written to Health Canada in April, the Ontario Beekeepers Associationurged the agency to put a moratorium on the approval of NNIs. “The preliminary results of this study, which are based on a serious flaw in the design, are not a basis for inaction on the part of regulators or policy-makers,” it added.
Critics also worry about a potential conflict of interest, citing Scott-Dupree’s ties to the industry. In July, she co-authored a study that looked at the effects of NNIs on bees in Canada. The study was co-written with David Drexler, a recently retired director of development and licensing at Bayer.
The paper downplayed the negative effects of NNIs, pointing out that the media had “practically ignored” bee death incidents that did not involve NNIs.
Scott-Dupree says her study was a review of a Health Canada database and that it showed that bee deaths caused by NNIs were mostly moderate to minor incidents. “There’s a lot of insecticides out there that you should be looking at as well if you’re going to try and start blaming chemicals for these losses.”
Scott-Dupree says that Drexler shares her views on this issue and that it is a “very balanced perspective.”
“I’m not saying I’m for or against neonicotinoids. In that particular study I am simply presenting the data in the way it appears in reports presented by the federal government.”
Health Canada is not expected to complete its review of clothianidin before 2018. Meanwhile, Ontario Premier Kathleen Wynne asked the federal government to expedite its review of NNIs.
But that may be too late for many beekeepers.
“The problem is bee keepers are finding it less and less profitable and more and more difficult to keep bees and are not necessarily willing to do it,” says Krupke. “So it’s not that we’ll have a collapse and we won’t have any bees; we won’t have beekeepers. And that is what in turn will lead to a shortage of bees, because it’s just too difficult to do the job.”
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