Naslov
Long-term impact of plant protection product mixtures on earthworms in agricultural fields

Autori
Schmidt, Thomas, Viric Gasparic, Helena ; Kimmel, Stefan ; Hoeger, Stefan ; Bazok, Renata

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

Izvornik
Book of abstracts, IOBC / WPRS 12th meeting of the Working Group “Pesticides and Beneficial Organisms” / Smagghe, Guy ; Pajač Živković, Ivana - Zagreb, 2018, 11-11

Skup
12th meeting of the IOBC / WPRS: Working Group "Pesticides and Beneficial Organisms"

Mjesto i datum
Zadar, Hrvatska, 30.09.2018. - 04.10.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Environmental risk assessment, earthworms, pesticide residues, bioconcentration factors

Sažetak
The environmental risk assessment of plant protection products on soil organisms is mainly based on the outcome of laboratory and extended laboratory studies (EFSA, 2017) while the link from the laboratory to realistic field conditions over several seasons is not well established. Current environmental risk assessment has the focus on single compounds and does not take into account that soil organisms are exposed to a mixture of active ingredients from different plant protection products. In this study, earthworms were sampled at two seasons from eight fields in Croatia and analysed for 300 active ingredients. The concentrations of 26 analysed active ingredients ranged between 0.000 and 0.247 mg/kg earthworm fresh weight with a mean of 0.005 mg/kg earthworm fresh weight. The percentage of samples with values below the limit of detection (LOD), values below the limit of quantification (LOQ = 0.001 mg/kg) and values above LOQ were 29, 42 and 29%, respectively. Based on publicly available draft assessment reports from EC and EFSA, degradation parameters (DT50, DT90) were used to calculate degradation curves and the current concentration in a soil at the date of earthworm sampling. Subsequently, substance-specific concentration factors in soil were established by dividing the analysed pesticide residues in earthworms by the calculated concentrations in soil. The aim of this survey was to check the applicability and reliability of this method by examining: (i) whether the bioconcentration factors calculated in this study are comparable to published bioconcentration factors ; (ii) whether mixtures of active ingredients with the same mode of action do pose a risk to the soil earthworm community. Preliminary results show that bioconcentration factors calculated in this study are in a similar range as in the publicly available literature. At least in the case of some fungicides, the “No-ObservedEffect-Concentration” for reproduction on Eisenia fetida (Savigny, 1826) is < 1 mg/kg dry soil and may have effects on field earthworm species reproduction for some periods of the growing season.

Izvorni jezik
Engleski

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