Naslov
Pesticide residues in carabid beetles

Autori
Viric Gasparic, Helena ; Drmić, Zrinka ; Cacija, Maja ; Bazok, Renata ; Lemic, Darija

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

Izvornik
Book of abstracts, IOBC / WPRS 12th meeting of the Working Group “Pesticides and Beneficial Organisms” / Smagghe, Guy ; Pajač Živković, Ivana - Zagreb, 2018, 36-36

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
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Carabids, residues, insecticides, fungicides, herbicides

Sažetak
Carabids are predators of insects and small invertebrates, they also feed on weed seeds but simultaneously present important food source to animals at a higher trophic level. As such, they are often used in research especially those related to agrochemicals. Intensive production with higher pesticide input has been highlighted as critical issue that led to a decrease in number of beneficial organisms. In this research, we aimed to investigate are there pesticide residues present in carabids collected in one of the most typical agroecosystem i.e. crop production area. The research was conducted in eastern Croatia on two distinct localities Lukač and Tovarnik during 2016. At each location carabid samples were collected in May, July and September on sugar beet fields grown as three different variants: (i) from untreated seed - control ; (ii) from seed treated with imidacloprid ; (iii) from seed treated with thiamethoxam. During vegetation all other standard agrotechnical measures were conducted as well. Samples were collected using covered pitfall traps with saline solution. Pesticide residue analysis on 300 different active ingredients was carried out by a certified laboratory using an analytical method based on the QuEChERS approach and high- performance liquid chromatography-tandem mass spectrometry (LC-MS/MS) whose limit of quantification is 0.001 ppm. Data on weather conditions were also collected at closest meteorological stations. Higher catches of carabids were recorded in Lukač what is in relation to a conservation type of tillage, lower input of agrochemicals, lower temperature and more humid area which are better suited to carabid optimal development conditions. The analysis revealed that four insecticides, six fungicides and six herbicides were found in carabid samples. Insecticide fipronil was detected in Tovarnik at concentration 0.040 ppm while in Lukač we found imidacloprid in concentration of 0.027 ppm. Technically pure imidacloprid has proven to be lethal for Poecilus cupreus L. larvae at concentration of 0.4 mg/kg, while there is no data for other insecticide groups. Since all neonicotinoids are from now on banned form use by EU Commission Regulation from 2018, lower pressure on beneficial organisms can be expected. Among six fungicides epoxiconazole was detected at both locations with concentrations between 0.016 ppm in Tovarnik and 0.052 ppm in Lukač. According to PPDB, epoxiconazole has been shown to have moderate to high toxicity on sediment dwelling organisms and invertebrates. It is persistent in soil and has the ability of accumulation in tissues. Herbicide ethofumesate was also present at both localities, but at much higher concentrations in Tovarnik (0.281 ppm). According to the PPDB there is no recorded negative impact of ethofumesate on arthropods present in the soil. Determined residues are too low to make conclusions about their negative impact but it should be taken into account that some pesticides may bind to the body's fatty tissue. If knowing that fungicides, next to insecticides, are a group that has been shown to have a negative effect on beneficial organisms, more attention should be given to possible adverse effects and accumulation in carabid beetles.

Izvorni jezik
Engleski

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