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SCIENCE MATTERS: It’s time to nix neonics 

click to enlarge VIA THE DAVID SUZUKI FOUNDATION
  • via the David Suzuki Foundation

The Canadian government is banning plastic microbeads in toiletries. Although designed to clean us, they’re polluting the environment, putting the health of fish, wildlife and people at risk. Manufacturers and consumers ushered plastic microbeads into the marketplace, but when we learned of their dangers, we moved to phase them out.

Why, then, is it taking so long to phase out the world’s most widely used insecticides, neonicotinoids? Scientists have proven they’re harming not only the pests they’re designed to kill, but also a long list of non-target species, including pollinators we rely on globally for about one-third of food crops.

Neonics are systemic pesticides. Plants absorb and integrate them into all tissues—roots, stems, leaves, flowers, pollen and nectar. First introduced in the 1990s, they now account for one-third of the global pesticide market. Agricultural applications include leaf sprays, and seed and soil treatments. They’re also used for trees, turf products, and flea and tick treatments for pets.

We’ve known about neonics’ harmful impacts on pollinators and ecosystems for years, but this summer, two major scientific releases added significantly to the ever-growing body of research proving widespread use of these toxic chemicals must stop.

On September 18, the Task Force on Systemic Pesticides—an international group of independent scientists convened by the International Union for Conservation of Nature—released an update to its 2015 Worldwide Integrated Assessment of the Impact of Systemic Pesticides on Biodiversity and Ecosystems. The 2017 update takes into account more than 500 additional peer-reviewed studies, revealing broader impacts and reinforcing the 2015 conclusions that neonics represent a major worldwide threat to biodiversity, ecosystems and the services nature provides.

On October 6, task force scientist Edward Mitchell and an interdisciplinary team from the University of Neuchâtel and the Botanical Garden in Neuchâtel, Switzerland, published a study in Science, which found three-quarters of the honey produced throughout the world contains neonics. Although concentrations were below the maximum authorized for human consumption, they surpassed levels proven to affect bees’ behaviour, physiology and reproductive abilities.

Conducted in 2015 and 2016, the study analyzed 198 honey samples from around the world, searching for the five most common neonics: acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam. Seventy-five percent contained at least one, with proportions varying considerably by region. The highest levels were in North America (86 percent), Asia (80 percent) and Europe (79 percent), with the lowest in South America (57 percent).

Thirty percent of all samples contained a single neonicotinoid, 45 percent contained between two and five and 10 percent contained four or five. Regulators don’t tend to consider the “cocktail effects” of contamination by multiple neonics. The impacts on bees, humans and other organisms are still undiscovered, but I bet they won’t be good.

These new findings restate the need to stop all mass-scale systemic pesticide use. Maintaining the status quo means continuing environmentally unsustainable agricultural practices. After all, the latest science also shows that in many cases, neonics provide little or no real benefit to agricultural production. Instead, they decrease soil quality, hurt biodiversity and contaminate water, air and food. They can’t even be relied on to decrease farmers’ financial risk or assist significantly with crop yields.

What are governments doing with this information?

In 2013, the European Union imposed a moratorium on certain uses of three neonics on bee-attractive crops: imidacloprid, clothianidin and thiamethoxam. The EU is now considering extending the moratorium. Meanwhile, the new French biodiversity law aims to ban all neonics starting in September 2018. North American regulators, meanwhile, have failed to recognize the urgent need to prevent neonics from further contaminating the environment.

Health Canada’s Pesticide Management Regulatory Agency has proposed phasing out one neonic, imidacloprid, but not until 2021 at the earliest—possibly as late as 2023. While industry continues to lobby Ottawa to continue using the toxic chemicals, environmental groups are calling for faster phase-out plans and an end to neonic use.

If we care about the quality and security of our food sources — and the species and ecosystems they rely on—the time for neonics is over. Sustainable and affordable agricultural and pest management practices exist. It’s time to ban bee-killing pesticides.

———
Science Matters is a weekly column on issues related to science and the environment from David Suzuki, written with contributions from David Suzuki Foundation communications manager Brendan Glauser. Learn more at davidsuzuki.org.

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