Impact of glyphosate on honeybees
Glyphosate and glyphosate-based formulations have been extensively tested in the laboratory and in the field to evaluate their potential toxicity to honeybees. When glyphosate was sprayed on large areas of vegetation directly adjacent to beehives it was found to have no acute or chronic effects on adult honeybees or brood production – even at concentrations three times higher than usual application rates 4. These same researchers also showed no effects to adult honeybees and their brood in direct feeding experiments with concentration levels that were two to three orders of magnitude above environmental exposure levels. In addition, an Australian brood study demonstrated that glyphosate has no impact on bees 5, 6.
The conclusions from all of these acute and chronic studies demonstrate that honeybee adults and larvae are not affected by glyphosate or glyphosate-based formulations in realistic field scenarios. These results have also been confirmed by a bee brood study conducted recently to meet the current EU testing requirements for the glyphosate authorisation renewal.
Last update: 25 October 2012