In February 2018, the European Food Safety Authority (EFSA) confirmed that the pesticide group of neonicotinoids is harmful to bees. A novel pesticide manufactured by Bayer AG is therefore being discussed as an alternative; it contains flupyradifurone from the class of butenolides. The product goes by the brand name of Sivanto.
Sivanto is assumed to be effective against various sucking insects such as aphids and whiteflies and can be used on a number of fruit and vegetable crops, but also on cocoa and coffee plants. Advertised as bee-friendly, the pesticide can even be applied on flowering fields. It has been available in the US market since 2015. In the EU, it is approved, but not yet available.
Measurable impact on honeybees
Scientists from the University of Würzburg have now investigated the effect of flupyradifurone on honey bee behavior. The study led by Ricarda Scheiner, Professor for Neuroethology of Arthropods and Hannah Hesselbach, her PhD student was published in the current issue of Scientific Reports.
“Our data show that non-lethal doses of flupyradifurone after a single application to collecting honey bees have a negative impact on the bees’ taste, learning and memory capability,” Ricarda Scheiner sums up the study result.
No impact when used properly
The two researchers first tested the bees’ gustatory response to sugar using a standard procedure. Subsequently, the bees were subjected to olfactory conditioning, and on the next day the scientists tested their memory to see what the bees had retained. “Whereas the two smaller doses did not exhibit any adverse effect, a flupyradifurone amount of 1.2 microgrammes per bee results in significantly reduced perception and learning performance,” Hannah Hesselbach says.
The good news, however, is that the collecting honey bees will probably not come into contact with such high doses when the pesticide is applied properly. But the scientists believe that further research is necessary to determine the pesticide’s influence on motor function, waggle dance or orientation.
“Also, we cannot say which influence flupyradifurone will have on bees in combination with other pesticides, which are frequently found in honey and pollen in residual amounts,” Hannah Hesselbach adds. The impact on wild bees and other pollinators should also be examined according to the researchers.