Naslov
The degradation of imidacloprid and thiamethoxam in sugar beet plants in open field conditions and in glasshouses

Autori
Drmić, Zrinka ; Viric Gasparic, Helena ; Čačija, Maja ; Lemic, Darija ; Bažok, Renata

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
ICE 2016 / Entomological Society of Amerika - Annapolis : Entomological Society of Amerika, 2016

Skup
2016 International Congress of Entomology

Mjesto i datum
Orlando (FL), Sjedinjene Američke Države, 25.09.2016. - 30.09.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
neonicotinoids ; degradation ; sugar beet

Sažetak
It is anticipated that the use of neonicotinoids on sugar beet seeds is not endangering bee populations and the temporal prohibition of imidacloprid, thiamethoxam and clothianidin implemented by EU (EU regulation 485/2013) is not valid for sugar beet. Our study aims to establish the degradation of imidacloprid and thiamethoxam in sugar beet plants (roots and leaves) through the vegetation, in different climatic and in controlled conditions. In two field and one glasshouse trial, untreated sugar beet seeds and seeds treated with imidacloprid and thiamethoxam have been sown. Starting from four weeks after sowing, the plant samples were collected every two weeks and analyzed for insecticide residues. After the extraction by QuEChERS method, the neonicotinoids were detected by HPLC (LC-MS/MS) method. Field trials were carried out in east (Tovarnik) and north (Lukač) Croatia. Weather conditions differed among investigated areas including significant differences in average monthly temperatures and the total amount of rainfall. The results confirm faster degradation of both insecticides in field comparing to the greenhouse conditions. No significant differences in the degradation rate between localities were observed. In field conditions, the residue levels of both insecticides in roots were below MRL after eight to ten weeks. In greenhouse trial, the degradation rate was significantly slower. The degradation rate in leaves was significantly faster comparing to the degradation in root samples, in both field and greenhouse conditions. At the time of harvesting, the residue levels were below MRL in all samples.

Izvorni jezik
Engleski

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