How Neonicotinoid Pesticides Are Decimating Our Bee Populations

how neonicotinoid pesticides are decimating our bee populations

 

Have a hankering for a big juicy apple? Enjoy eating almonds? Maybe you buy milk from grassfed cattle?

None of this would be possible without the amazing help of insects. Pollinating insects, especially bees, play a crucial role in the pollination of many crops that are important sources of food for humans as well as pollinating grasses that are used to feed many animals.

Unfortunately, bee keepers have reported staggering losses to their colonies over the last decade. Reports show that about 30% of bee hives do not survive the winter months due to the unusual disappearance of worker bees, resulting in “colony collapse disorder” (CCD).[fn value=1][/fn] In conjunction with the disappearing domesticated bee populations, wild pollinators such as bumble bees and butterflies have been dying off at an exponential rate. In fact, in the United States, the bumble bee was just placed on the endangered species list for the first time ever.

What happens without pollinators?

Bees, such as honeybees, bumble bees, and solitary bees, are the backbone of the group of insects known as pollinators, and 35% of the world’s food crop depends on pollinators (think nuts, seeds, grasses that are fed to animals, and many fruits and vegetables).[fn value=2][/fn] In other words, at least one in three mouths are fed by food that requires pollinators.[fn value=3][/fn]

Why are the bees dying off?

A leading hypothesis is that an incredibly prevalent group of pesticides, collectively known as neonicotinoids, are largely responsible for the poisoning of pollinator insects. Research has since shown that there are numerous ways in which bees are exposed to these dangerous chemicals.

Neonicotinoids were introduced in the early 1990s and they are now one of the most commonly used insecticides in the world.[fn value=4][/fn]  These chemicals are used in large-scale agriculture because they are extremely toxic to insects and much less toxic to vertebrates.[fn value=5][/fn] Crops commonly treated with neonicotinoids include corn, cotton, canola, sunflower, and soy. In fact, neonicotinoids are used on almost all of the corn grown in North America, with the exception being organic corn.[fn value=6][/fn] Recent studies show that these pesticides are so ubiquitous that they are also making their way into drinking water in agricultural areas.[fn value=7][/fn]

Neonicotinoids are applied in a variety of ways including soil drenching and seed dressings.[fn value=8][/fn]  [fn value=9][/fn] The half-life of neonicotinoids can exceed 1,000 days when applied to soil, so they accumulate in the soil, and when taken up into crops they are present in the pollen and in sap droplets that form on leaves (a favorite of bees), known as guttation droplets.[fn value=10][/fn]  Even worse, not only are mature forager bees looking for pollen affected by these poisons, but they also bring contaminants back to the hive, killing young bees and nurse bees.

Currently, seed dressing is one of the most common ways these pesticides are applied.[fn value=11][/fn] When these pesticide-coated seeds are planted, it creates neonicotinoid-contaminated dust, poisoning nearby insects.[fn value=12][/fn]  Tests show the concentrations of pesticides in these dusts are much higher than the lethal dose for honeybees.[fn value=13][/fn]

What can you do?

First it should be noted that organic standards in the United States do not allow neonicotinoids, so when you purchase organic produce and other organic products you are voting for non-neonicotinoid-dependent agriculture. Buying organic animal products is another great option—neonicotinoid treated corn is fed to conventional livestock—whereas organic livestock must be fed organic corn that cannot be treated with neonicotinoids. Pasture-based animal products such as grassfed beef and pasture-based dairy are also much less reliant on neonicotinoids, as these animals are raised primarily on grasses.

Always remember to consider your impact on the environment, even when buying ornamental plants. Ask the nursery if they have a non-neonicotinoid policy (they’re sometimes called neonics) in the growing of their plants, or go to organic nurseries. Become informed. Vote with your dollar to save the bees!

For a more comprehensive review of this subject, click here.



References

[1]D. vanEngelsdorp, D. Cox Foster, M. Frazier, N. Ostiguy and J. Hayes, ""Fall-dwindle disease": Investigations inot the causes of sudden and alarming colony losses experienced by beekepeers in the fall of 2006. Prelimarly Report: First Revision," Pennsylva
[2]A. Klein, B. Vaissiere, J. Cane, I. Steffan-Dewenter, S. Cunningham, C. Kremen and T. Tscharntke, "Importance of pollinators in changing landscapes for world crops," Proc R Soc B, vol. 274, pp. 303-313, 2007.
[3]D. vanEngelsdorp and M. Meixner, "A historical review of managed honey bee populations in Europe and the United States and the factors that may affect them," J Invertebr Pathol, vol. 103, pp. S80-S95, 2007.
[4]J. Bonmatin, G. Giorio, V. Girolami, D. Doulson, D. Kreutzweiser, C. Krupke, M. Liess, E. Long, M. Marzaro, E. Mitchell, D. Noome, N. Simon-Delso and A. Tapparo, "Environmental fate and exposure; neonicotinoids and fipronil," Environ Sci Pollut Res, vol.
[5]U. EPA, "Office of pesticide programs, factsheet clothianidin," EPA, Washington, DC, 2003.
[6]"National Agriculture Statistics Service (NASS), Online Database: Crop production 2010 summary," 2010. [Online]. Available: http;//usda.mannlib.cornell.edu/MannUsda/viewdocumentinfo.do?documentID=10471. [Accessed 4 2017].
[7]Gregory H. LeFevre et al. Occurrence of Neonicotinoid Insecticides in Finished Drinking Water and Fate during Drinking Water Treatment. Environmental Science & Technology Letters, April 2017
[8]T. Blacquiere, G. Smagghe, C. van Gestel and V. Mommaerts, "Neonicotinoids in bees: a review on concentrations, side-effects and risk assessment," Exotoxicology, vol. 21, pp. 973-992, 2012.
[9]A. Fairbrother, J. Purdy, T. Anderson and R. Fell, "Risks of Neonicotinoid Insecticides to Honeybees," Environ Toxicol Chem, vol. 33, pp. 719-731, 2014.
[10]V. Girolami, L. Mazzon, A. Squartini, N. Mori, M. Marzaro, A. Di Bernaro, M. Greatti, C. Giorio and A. Tapparo, "Translocation of neonicotinoid insecticides from coated seeds to seedling guttations: a novel way of intoxication for bees," J Econ Entomol, v
[12]V. Girolami, M. Marzaro, L. Vivan, L. Mazzon, M. Greatti, C. Giorio, D. Marton and A. Tapparo, "Fatal powdering of bees in flight with particulates of neonicotinoids seed coating and humidity implication," J Appl Entomol, vol. 136, pp. 17-26, 2012.
[13]C. Krupke, G. Hunt, B. Eitzer, G. Andino and K. Given. Multiple routes of pesticide exposure for honey bees near agricultural fields. PLoS One. 2012. vol. 7, p. e29268, 2012.