Is EPA-approved insecticide (clothianidin) responsible for killing off bees?
A recent article in NaturalNews claims that last year there were leaked documents exposing that the U.S. Environmental Protection Agency’s (EPA) illegitimately approved toxic pesticide clothianidin for use, while being aware it might kill bees.
Now, the article says, there’s a new study by Purdue University that confirms that clothianidin is actually killing off bees, and that it’s spread has become systematic in the entire food chain.
The entire report is available online via PubMed: Multiple Routes of Pesticide Exposure for Honey Bees Living Near Agricultural Fields
The article goes on to warn about the consequenses of all this:
Without bees, which are now dying off at an alarming rate due to exposure to clothianidin and various other insecticides and fungicides, one third or more of the food supply will be destroyed, including at least 100 varieties of fruits and vegetables that rely on bees for pollination.
The claim is that if people in US don’t do something to stop the bees from dying, at least one third of the food supply (in the US) will be destroyed. Because bees are dying. Which is the caused mainly by clothianidin. Which is in use because of EPA’s failure or corruption.
Is this information accurate? Or does the article misrepresent the situation somehow? Is the study legitimate?
Related: Are Bees Disappearing and Why
There is controversy over the role of neonicotinoids in relation to pesticide toxicity to bees and imidacloprid effects on bee population. Neonicotinoid use has been strictly limited in France since the 1990s, when neonicotinoids were implicated in a mass die-off of the bee population. It is believed by some to account for worker bees’ neglecting to provide food for eggs and larvae, and for a breakdown of the bees’ navigational abilities, possibly leading to what has become generally known as Colony Collapse Disorder.
Low concentrations of imidicloprid and clothianidin have impacts upon bees’ ability to forage and return to the hive.
The results show that almost all the control honey bees returned to the hive, and started again visiting the feeder between 2 to 5 hours after the release. Honey bees fed with the concentration of 100 ppb also returned to the hive, but they returned to visit the feeder only 24 hours after the release. Honey bees fed with 500 ppb and 1000 ppb completely disappeared after the release, and they were not seen during the following 24 hours, neither at the hive nor at the feeding site.
But neonicotinoid insecticides are only one of of many things impacting upon bees, and most research indicates that it is a combination of factors that is behind CCD.
The most recent report (USDA – 2010) states that “based on an initial analysis of collected bee samples (CCD- and non-CCD affected), reports have noted the high number of viruses and other pathogens, pesticides, and parasites present in CCD colonies, and lower levels in non-CCD colonies. This work suggests that a combination of environmental stressors may set off a cascade of events and contribute to a colony where weakened worker bees are more susceptible to pests and pathogens.” Applying proteomics-based pathogen screening tools in 2010, researchers announced they had identified a co-infection of invertebrate iridescent virus type 6 (IIV-6) and the fungus Nosema ceranae in all CCD colonies sampled. (Quoted from Wiki, original USDA report linked above)
So this issue is much larger than any one chemical group and is about environmental management and pesticide usage in general. Most insecticides will kill bees, especially with direct contact. Bees are only one of several pollination vectors in the world, so while they are important, this scare campaign is misguided. What is actually needed is further understanding of CCD, bee breeding programs and management strategies that will actually deal with this issue.
Also, as a general rule of thumb, just about anything that appears on Natural News is likely to be wrong.
Update: A paper published in the middle of last year has some interesting results that could indicate a/the driver of CCD in horticulture. Essentially the article shows that bees don’t just forage on one farm, instead collecting pollen from the surrounding area as they see fit. As such, they come back with all sorts of pollens and all sorts of pesticides and fungicides. It is this combination of pesticides and fungicides in the bees’ found that appears to make the bees a bit sick, so they are more likely to get lost whilst foraging or get infected with mites and fungi. Note the lack of worry about clothianidin and other neonicotinoids, but rather the fungicides being the big problem. To quote:
Our results show that beekeepers need to consider not only pesticide regimens of the fields in which they are placing their bees, but also spray programs near those fields that may contribute to pesticide drift onto weeds. The bees in our study collected pollen from diverse sources, often failing to collect any pollen from the target crop (Fig. 1). All of the non-target pollen that we were able to identify to genus or species was from wildflowers (Table S1), suggesting the honey bees were collecting significant amounts of pollen from weeds surrounding our focal fields.
This indicates that beekeepers and horticultural farmers don’t appear to be respecting withholding periods for agricultural sprays the way they should. Partly because the bees are foraging where they don’t expect them to and partly because they haven’t correctly planned sprays and pollination. It will be interesting to see if these results are backed up by more causative work, although I’m not sure it will apply to broadacre farming (does that mean CCD is mainly a horticulture and small hectare farming issue?).
Update: reasonably balanced TED talk on CCD: