Science. Pesticides with neonicotinoids is dangerous for wild bees and bumblebees than previously thought.
A comprehensive British study shows that the funds provide long-term damage to the insect communities.
In the study, the researchers examined the performance of 62 species of bees all over England from 1994 to 2011, the period when the neonicotinoids were first used in the British agriculture.
They found evidence that agents causing large-scale damage, and the damage is of a lasting nature.
Neonicotinoids are very effective insecticides, accounting for a large share of total pesticides in agriculture in many parts of the world.
in the past four years, several research groups, including Sweden, raised the alarm about the funds. Experimental studies have shown that neonicotinoids are killing many pollinating bees.
Toxic rapeseed
in particular, the funds are used in rapeseed cultivation frequented by such insects.
the new study, published in Nature Communications, provides a more complete picture than before, because it shows the impact of the funds over many years.
It states that many pollinating insects in England have decreased in number as a result of large-scale changes in agriculture – but the species that regularly feed on pollen and nectar from canola has decreased three times as much as the species only visit rapeseed temporarily.
bees die
some species of bees have disappeared from some areas, and the researchers state that neonicotinoids safety behind a fifth of these extinctions.
the many alarms research has resulted in some of neonicotinoids banned in the EU and Sweden. However, there are concerns that the ban should be torn up. Currently, a review of the regulatory framework and two chemical companies have sued the European Commission to have the decision revoked.
The companies believe the ban is based on incomplete information. But if this attitude can be defended in the future, after the new British findings is uncertain.
FACTS
Neonicotinoids and insects
Neonicotinoids are a special group of insecticides, insecticides.
They are used in, for example rapeseed fields where canola seeds treated, pickled, with the funds.
Chemically have neonicotinoids, as the name suggests, very similar to nicotine. The insects become paralyzed and die at a sufficiently high concentration. To certain insect pests, they are very effective, but they also affect wild bees and bumble bees.
Frequently honeybees did not hit as hard as the wild species, which may be due to their communities is very big and can withstand large losses.
Source: Nature Communications
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