Pages tagged "Neonicotinoids"
The world’s most used weedkiller damages the beneficial bacteria in the guts of honeybees and makes them more prone to deadly infections, new research has found.
Previous studies have shown that pesticides such as neonicotinoids cause harm to bees, whose pollination is vital to about three-quarters of all food crops. Glyphosate, manufactured by Monsanto, targets an enzyme only found in plants and bacteria.
However, the new study shows that glyphosate damages the microbiota that honeybees need to grow and to fight off pathogens. The findings show glyphosate, the most used agricultural chemical ever, may be contributing to the global decline in bees, along with the loss of habitat.
“We demonstrated that the abundances of dominant gut microbiota species are decreased in bees exposed to glyphosate at concentrations documented in the environment,” said Erick Motta and colleagues from University of Texas at Austin in their new paper. They found that young worker bees exposed to glyphosate exposure died more often when later exposed to a common bacterium.
Other research, from China and published in July, showed that honeybee larvae grew more slowly and died more often when exposed to glyphosate. An earlier study, in 2015, showed the exposure of adult bees to the herbicide at levels found in fields “impairs the cognitive capacities needed for a successful return to the hive”.
“The biggest impact of glyphosate on bees is the destruction of the wildflowers on which they depend,” said Matt Sharlow, at conservation group Buglife. “Evidence to date suggests direct toxicity to bees is fairly low, however the new study clearly demonstrates that pesticide use can have significant unintended consequences.”
Prof Dave Goulson, at the University of Sussex, said: “It now seems that we have to add glyphosate to the list of problems that bees face. This study is also further evidence that the landscape-scale application of large quantities of pesticides has negative consequences that are often hard to predict.”
Photo from Pexels.
The UK will back a total ban on insect-harming pesticides in fields across Europe, the environment secretary, Michael Gove, has revealed.
The decision reverses the government’s previous position and is justified by recent new evidence showing neonicotinoids have contaminated the whole landscape and cause damage to colonies of bees. It also follows the revelation that 75% of all flying insects have disappeared in Germany and probably much further afield, a discovery Gove said had shocked him.
Neonicotinoids are the world’s most widely used insecticide but in 2013 the European Union banned their use on flowering crops, although the UK was among the nations opposing the ban. The European commission now wants a total ban on their use outside of greenhouses, with a vote expected in December, and the UK’s new position makes it very likely to pass.
“The weight of evidence now shows the risks neonicotinoids pose to our environment, particularly to the bees and other pollinators which play such a key part in our £100bn food industry, is greater than previously understood,” said Gove. “I believe this justifies further restrictions on their use. We cannot afford to put our pollinator populations at risk.”
Rep. Earl Blumenauer (D-Ore.) wants to include a ban on pesticides linked to declining bee health in next year’s farm bill
Rep. Earl Blumenauer (D-Ore.) wants to include a ban on pesticides linked to declining bee health in next year’s farm bill, one of several initiatives he is pushing in the legislation to reauthorize agriculture and nutrition programs.
Thirty-one Democrats are backing a bill—the Saving America’s Pollinators Act of 2017 ( H.R. 3040)—that would suspend the approval of neonicotinoid pesticides, common insect-killers that are said to harm honeybees, aquatic insects, birds, and other insects and animals. H.R. 3040 would ban imidacloprid, clothianidin, thiamethoxam, dinotefuran, and any other neonicotinoids until the Environmental Protection Agency can determine that the pesticides won’t harm pollinators, based on peer-reviewed studies.
Blumenauer, one of the bill’s sponsors, told Bloomberg BNA he hopes the bill “will be folded into part of a larger initiative” like the next farm bill. Blumenauer is set to release a report next week outlining several measures to support small farmers, local food systems, and sustainability.