Toxicity to honeybees of water guttation and dew collected from winter rape treated with Nurelle D
2006
Shawki, M.A.(Zagazig Univ. (Egypt). Plant Protection Dept.) E-mail:[email protected] | Titera, D.(Vyzkumny Ustav Vcelarsky, Libcice nad Vltavou (Czech Republic)) | Kazda, J.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju) | Kohoutkova, J.(Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Chemie a Analyzy Potravin) | Taborsky, V.(Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju)
Caged bees were fed on sugar syrup containing water guttation and dew collected from winter rape plants treated with the insecticide Nurelle (chlorpyriphos + cypermethrin) for 24 h (acute toxicity test) and for 10 days (chronic toxicity test). Bee mortality and feed consumption were determined daily. A contact toxicity test was performed within 24 h on bees kept in Petri dishes (10 bees per dish) lined with filter paper saturated with the test solution. The acute Nurelle contact and oral toxicity tests showed that the mortality of bees treated with water guttation and dew did not exceed 10%. A chronic toxicity test showed that adding contaminated water guttation and dew to the syrup caused an insignificant increase in bee mortality and reduced the syrup consumption significantly. The residues of chlorpyriphos and cypermethrin found in the contaminated water were below the limits of detection.
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