PARENT SESSION

1H a/b/c - Pesticides, pharmaceuticals, perfluoroalkylated substances, antibiotics
Poster Hall
8:30 AM - Wednesday, 30 April 2003
Chair: de Voogt, P.¹, ¹
Co-chair: Purdy, R.², Pluecken, U.³, Koerdel, W.⁴, Tolls, J.⁵, Kümmerer, K.⁶, ^{2 3 4 5 6}

(WEP/32) Measurement of exposure of fauna and flora in fields and field margins after application of KARATE WG ^® as a basis of risk assessment.

Schenke, Detlef¹, Baier, Barbara¹, Kaul, Peter², Gebauer, Sabine², Heimbach, Udo³, Kunde, Bärbel¹, ¹ Federal Biological Research Centre for Agriculture and Forestry,Institute for Ecotoxicology and Ecochemistry in Plant Protection, Berlin, Germany, Germany² Federal Biological Research Centre for Agriculture and Forestry, Division of Application Techniques, Kleinmachnow, Germany, Germany³ Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Protection in Field Crops and Grassland, Braunschweig, Germany, Germany

ABSTRACT- Field studies on the effect of spray drift on non-target arthropods in field margins are rare. From 1998 to 2000, a field study was carried out to determine the effects of spray drift of KARATE WG ^® applied with 7.5 g lambda-cyhalothrin/ha in a wheat field on non-target arthropods in the adjacent grass strip. The assessment of observed effects requires knowledge about the real exposure of the treated habitat. Penetration and coverage of the treated crop and spatial distribution of the drift cloud in adjacent grass strips are efficently described using fluorescent marker (0.6% BSF) added to the spray liquid. In contrast to tracer amounts, actual amounts of lambda-cyhalothrin residues are substantially influenced by plant surface, position of leaves, plant density and growth stage. Plant and soil samples are drawn in the field and in the grass strip, 1 m away from the field. Combination of both methods gives both a realistic picture of initial concentrations and allows to trace various situations of exposure over the time of the trial. In the end it is only that portion of pesticides which comes into contact with non-target organisms, which can really affect them. Therefore we measured lambda-cyhalothrin residues in the carabid beetles Poecilus cupreus and Pseudoophonus rufipes. Adult Poecilus cupreus which had been reared in laboratory were released in the field and in the grass strip, again 1 m away from the field boundary, and subjected to a semi-field test. At the same time, Pseudoophonus rufipes were caught with pitfall traps in the field and in the adjacent grass strip (3 m away from boundary). This beetles occurs naturally in the test area. The paper discusses the various situations of exposure found by the described analytical and trial methods.

Key words: spray drift, field study, carabid beetles, lambda-cyhalothrin