In recent years there has been growing concern about the impact of pesticides in agriculture on bee health, with much of the focus being on so-called "neonicotinoids" or "neonics" ("neonics" for short).
The neonic has become ever closer, and manufacturers have developed pesticides that are considered "bee safe". However, one of these substances, flupyradifuron (FPF), which is marketed under the name Sivanto, can cause harm to bees even if a common fungicide is present. This emerges from a study published in the journal . Procedure of the Royal Society B: Biological Sciences .
FPF works much like Neonik. However, since it is labeled "bee safe", it can be used while the insects are actively looking for food.
The authors of the study from the University of California, San Diego and the EU Reference Laboratory for Honeybee Health in France say their new findings challenge the safety of authorized pesticides, as risk assessments currently do not take into account how toxicity is due to combinations of different Chemicals is affected.
"Bees may be exposed to several pesticides that work synergistically to enhance their side effects," the authors wrote in their paper.
So far, the effects of FPF have not been thoroughly investigated. Accordingly, the researchers chose to test their lethal and sub-lethal toxic effects on honey bees over various seasons and for different types of workers, as well as the drug's interactions with a fungicide known as propiconazole. They used dosages to simulate the amounts to which the insects are exposed in real situations.
The researchers found that bees exposed to FPF combined with the fungicide ̵
They also found that these effects were significantly influenced by worker type and season: Bees were four times more affected than bees in bees and both groups were more affected during the summer months compared to spring.
The graph provided by Statista illustrates the worldwide decline of various insect populations. 
The authors say that these results could have a significant impact on the approval of certain pesticides.  "Because the risk assessment [RA] is relatively limited, testing that only marginally affects the behavior of bees and does not take into account the influence of bees and beekeeping, our findings raise concerns about the safety of authorized pesticides, including FPF," they write Authors. "We also suggest that pesticides RA on common chemical Testing synergistic synergies in terms of behavior and survival. "
Although FPF research was limited, a previous study found that the bee's taste and chemical perceptibility when exposed to high crops are high -realistic doses. Another paper found that chronic exposure had an impact on the animal's olfactory system.  Robert Alexander / Getty Images
This item has been updated by an infographic.