A University of Guelph study is the first to uncover the impact of neonicotinoid pesticides on honey bees' ability to groom and rid themselves of deadly mites. The research comes as Health Canada places new limits on the use of three key neonicotinoids while it decides whether to impose a full phase-out of the chemicals. Published in the Nature journal Scientific Reports, the study revealed that when honey bees are infected with varroa mites and then regularly exposed to low doses of a commonly used neonicotinoid called clothianidin, their self-grooming behaviour drops off.
Sie werden immer weniger: Eine Biene auf einer Blüte. Doch der Einsatz von Pestiziden in der Landwirtschaft macht den Insekten zu schaffen. Der Rückgang der Insekten im Werra-Meißner-Kreis ist dramatisch. Hauptursache sei der massive Einsatz von Pestiziten in der Landwirtschaft, so Wolfram Brauneis, Naturschützer und Ornithologe.
A pesticide used to control aphids and whiteflies called flupyradifurone, sold commercially as Sivanto, harms or even kills honey bees (Apis mellifera) when exposed to low doses in combination with a fungicide, according to the results of laboratory experiments published on April 10 in the Proceedings of the Royal Society B. The researchers find that when honey bees encounter both FPF and a commonly used fungicide, propiconazole (PRO), the effects are worse than FPF alone.
Researchers at the University of New Hampshire have found a dramatic decline of 14 wild bee species that are, among other things, important across the Northeast for the pollination of major local crops like apples, blueberries and cranberries. "We know that wild bees are greatly at risk and not doing well worldwide," said Sandra Rehan, assistant professor of biological sciences. "This status assessment of wild bees shines a light on the exact species in decline, beside the well-documented bumble bees.
A widespread loss of pollinating insects in recent decades has been revealed by the first national survey in Britain, which scientists say “highlights a fundamental deterioration” in nature. The analysis of 353 wild bee and hoverfly species found the insects have been lost from a quarter of the places they were found in 1980. A third of the species now occupy smaller ranges, with just one in 10 expanding their extent, and the average number of species found in a square kilometre fell by 11.
On March 22, representatives of European Agriculture Ministers will meet at the European Commission's Standing Committee on Plants, Animals, Food and Feed (ScoPAFF) to deliberate Thiacloprid's relicensing. Three other neonicotinoid insecticides (imidacloprid, clothianidin and thiamethoxam) were recently banned for outdoor use in all EU member states. They were banned from sale from 19 September 2018 and from use by 19 December 2018.
A new pesticide by the name of “Sivanto” was recently released by Bayer AG. Its active ingredient flupyradifurone binds to the nicotinic acetylcholine receptor (AchR) in the honeybee brain, similar to neonicotinoids. Nevertheless, flupyradifurone is assumed to be harmless for honeybees and can even be applied on flowering crops. So far, only little has been known about sublethal effects of flupyradifurone on honeybees. Intact motor functions are decisive for numerous behaviors including foraging and dancing.
Imidacloprid - a type of neonicotinoid - changes the way that worker bees interact with the colony’s larvae: they become less social, stop nursing larvae, experience altered social and spatial dynamics within nests, and cease hive insulation construction. A research team led by James Crall of Harvard University investigated the effects of imidacloprid using a robotic platform for continuous, multicolony monitoring of uniquely identified workers. Their research showed that the behaviours induced by imidacloprid lead to colony collapse.
Twelve pesticides made with chemicals shown to harm bees and other pollinators are slated to be banned as part of a proposed settlement with the manufacturers, the EPA announced Dec. 12. The pesticides, marketed by Syngenta AG., Bayer AG, and Valent USA Corp., contain either thiamethoxam or clothianidin, two chemicals in the neonicotinoid class that are linked to declining bee populations.
Akkerwijzer in 2009: Sinds 2000 sterven bijen massaal. Bijonderzoeker Tjeerd Blacquière van Universiteit Wageningen, maakt zich zorgen over deze situatie. Imkers kennen het fenomeen dat bijenvolken sterven. Gemiddeld sterft 10 procent in de winter. De afgelopen jaren lag dat percentage hoger en fluctueert dit. Blacquière wijt de sterfte aan de varraomijt. Romeé van der Zee, bijendeskundige uit Tersoal, denkt dat Nosema ceranea, een soort schimmel, de boosdoener is. Een andere oorzaak van de afname van de bijenvolken is de vergrijzing van de imkers.