From the BBC web site:
Attempts to find a new generation of pesticides to replace neonicotinoids have been dealt a potential blow.
Neonicotinoids are the most commonly used insecticide in the world, but had been linked to bee declines.
Studies suggest a new type of pesticide seen as an alternative to the chemicals, which have been banned in many countries, may have similar risks.
The new insecticides may reduce bumblebee reproduction in the wild, according to a study by UK scientists.
The alternatives had been sought because of the evidence linking neonicotinoids to declines in bee populations - leading to the bans and restrictions on their use.
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