• Pesticides are transferred by the bees from the crops to the hives
  • Pesticide residues are transferred to the hive immediately after use.
  • The residues of pesticides in worker bees have not exceeded 0.3% of the LD50.
  • Pyrimethanil and Cyprodinil have exceeded the Maximum Residue Levels in honey.
A field trial on the transfer of pyrimethanil, cyprodinil and cyflufenamid residues from apple trees of Idared cultivar to hives by honeybees Apis mellifera was carried out. Two days after spraying (Faban 500 SC and Kendo 50 EW), and on the day of spraying (Chorus 50 WG), the quantities of residues on leaves and flowers of apple trees and pollen were as follows: pyrimethanil: 1.45 μg per cm2 of leaves, 11.51 μg per single flower and 7.18 μg · g−1 of pollen, cyprodinil:1.35, 8.64 and 7.94 μg, and cyflufenamid: 0.064, 0.266 and 0.11 μg, respectively. All of them subsequently disappeared exponentially. Two days after, and on the day of spraying, pyrimethanil (1.81 μg · g−1), cyprodinil (up to 0.55 μg · g−1) and cyflufenamid (0.04 μg · g−1) were found in worker bees. Residues of all used chemicals were found in the brood, honey and wax samples. The residues of pyrimethanil, cyprodinil and cyflufenamid in worker bees exceeded the level of 0.2% of the LD50, which indicates that their application rates (doses) are safe for the honey bee.
We would like to thank Mr. Kazimierz Czepiela for his help in carrying out this research. The study was supported by funds from the University of Rzeszów, College of Natural Sciences.
The part of the research was supported by the project Interdisciplinary Center for Preclinical and Clinical Research (the project number RPPK.01.01.00- 18-0001/18).
Piotr Kaczyński
The authors have declared that no conflict of interests exist.
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