Other Studies
Bayer CropScience studies show that the maximum dose of imidacloprid for which no adverse effects were observed in bees is 20 ppb. Since Bayer claims that residue levels are usually below 5 ppb in pollen and nectar, they contend that imidacloprid poses a negligible risk to bees.
Gerard Eyries, marketing manager for Bayer's agricultural division in France, states that studies confirm that imidacloprid leaves a small residue in nectar and pollen, but there is no evidence of a link with the drop in France's bee population, adding, "It is impossible to have zero residue. What is important is to know whether the very tiny quantities which have been found have a negative effect on bees." He also added that the product was sold in 70 countries with no reported side effects.
Other independent studies have indicated that imidacloprid residues in plants can be higher:
- 10 to 20 ppb in upper leaves
- 100 to 200 ppb in other leaves
- 1.5 ppb in nectar
- 2 to 70 ppb in pollen
Read more about this topic: Imidacloprid Effects On Bees
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