Neonicotinoid insecticide uptake by maize and appearance in guttation liquid

Mörtl, Mária and Vehovszky, Ágnes and Győri, János and Darvas, Béla and Székács, András: Neonicotinoid insecticide uptake by maize and appearance in guttation liquid. Proceedings of the International Symposium on Analytical and Environmental Problems, (21). pp. 52-55. (2015)

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Abstract

Movement of clothianidin (CLO) and thiamethoxam (TMX) applied as maize seed dressing or spray application has been investigated in different soil types (sandy, clay or loam), and subsequent appearance of these compounds in the guttation liquid of maize are presented. Elution profiles for different soil types were determined in order to explore differences in binding capacity. Soil characterized by high organic matter content retained the ingredients, whereas high clay content resulted in delayed release of the compounds. Neonicotinoid uptake by non-coated maize plants was also determined via guttation liquid measurements after the neonicotinoid ingredients had been applied in spray format. The highest peak concentrations of TMX and CLO (0.546 and 1.83 µg/ml, respectively) were measured from plants planted in sandy soil, but these levels were still substantially lower than levels in samples taken from plants emerged from neonicotinoid-coated seeds (above 100 µg/ml). Moreover, the time of ingredient appearance in guttation liquid was also strongly influenced by soil type. Cross-contamination was established by measuring neonicotinoid concentrations in guttation liquid in plants emerged from differently coated (CLO and TMX) seeds potted near to each other and the effect of soil type has also been explored. Results for coated (CLO or TMX) and non-coated plants also confirmed that cross-contamination may occur by uptake through soil from neighboring seeds. Differences between non-coated and coated seeds gradually disappeared. This is the first record of neonicotinoid levels in guttation liquid of plants emerged from non-coated maize seeds.

Item Type: Article
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2015
Volume: 21
Page Range: pp. 52-55
ISBN: 978-963-306-411-5
Uncontrolled Keywords: Kutatás - mezőgazdasági, Kukorica, Agrokémia
Additional Information: Bibliogr.: p. 26-27. ; összefoglalás angol nyelven
Date Deposited: 2018. Dec. 05. 10:18
Last Modified: 2018. Dec. 05. 11:05
URI: http://acta.bibl.u-szeged.hu/id/eprint/55926

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