Unpublished field trials by pesticide manufacturers show their products cause serious harm to honeybees at high levels, leading to calls from senior scientists for the companies to end the secrecy which cloaks much of their research.
The research, conducted by Syngenta and Bayer on their neonicotinoid insecticides, were submitted to the US Environmental Protection Agency and obtained by Greenpeace after a freedom of information request.
Neonicotinoids are the world’s most widely used insecticides and there is clear scientific evidence that they harm bees at the levels found in fields, though only a little to date showing the pesticides harm the overall performance of colonies. Neonicotinoids were banned from use on flowering crops in the EU in 2013, despite UK opposition.
Bees and other insects are vital for pollinating three-quarters of the world’s food crops but have been in significant decline, due to the loss of flower-rich habitats, disease and the use of pesticides.
The newly revealed studies show Syngenta’s thiamethoxam and Bayer’s clothianidin seriously harmed colonies at high doses, but did not find significant effects below concentrations of 50 parts per billion (ppb) and 40ppb respectively. Such levels can sometimes be found in fields but concentrations are usually below 10ppb.
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“Here’s just another reason to start your plants from seeds and cuttings and bring them on yourself rather than buy from Garden Centers and Supermarkets. You could always buy them from a local guy you know and trust and keep the money in the community. Also buying organic certified plants may reduce your chances of pesticide exposure for you and the wildlife.”
Gardeners Beware (2014): Bee-toxic pesticides found in “bee-friendly plants sold at garden centers across the U.S. and Canada
Many “bee-friendly” home garden plants sold at Home Depot, Lowe’s and Walmart have been pre-treated with pesticides shown to harm and kill bees, according to a study released today by Friends of the Earth and allies.
The study, Gardeners Beware 2014, shows that 36 out of 71 (51 percent) of garden plant samples purchased at top garden retailers in 18 cities in the United States and Canada contain neonicotinoid (neonic) pesticides — a key contributor to recent bee declines. Some of the flowers contained neonic levels high enough to kill bees outright assuming comparable concentrations are present in the flowers’ pollen and nectar. Further, 40 percent of the positive samples contained two or more neonics.
The study is a larger follow up to a first-of-its-kind pilot study released by Friends of the Earth last August. The new study expanded the number of samples and number of locations where plants were purchased, and also assessed the distribution of neonic pesticides between flowers and the rest of the plant.
“The high percentage of contaminated plants and their neonicotinoid concentrations suggest that this problem continues to be widespread,” said Lisa Archer, director of the Food & Technology program at Friends of the Earth-U.S. “Most gardeners have no idea that their gardens may be a source of harm to bees. We’re calling on retailers to get neonicotinoid pesticides out of their plants and off their shelves as soon as possible. Until then, gardeners should buy organic plants to ensure the safety of bees.”
Continue reading “Pesticides Found On “Bee-Friendly” Plants Sold At Garden Centers”