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Measurement of Drift Resulted by the Cannon Sprayer Application

Langkamp-Wedde, Tina, Kanne-Schludde, Daniele, Rautmann, Dirk, von Hörsten, Dieter
Gesunde Pflanzen 2019 v.71 no.Supplement 1 pp. 33-39
biocides, collectors, edge effects, fluorescent dyes, forests, moths, nontarget organisms, sediments, sprayers, trees
The hair of the caterpillar of the oak processionary moth (OPM) can trigger allergic reactions in humans and animals. For the protection of humans and animals, biocidal products can be applied preventively. However, biocidal products may also affect non-target organisms, thereby affecting the environment. The authorization of biocidal products is regulated in the Biocidal Regulation. In order to assess the undesirable occurrence of biocidal products in environmental compartments, drift values are of crucial importance. The aim of this project is the measurement of drift when applied with a cannon sprayer to control the OPM on a forest edge, in an avenue and a solitary tree. To measure the drift as ground sediment collectors were placed on a measuring surface at intervals of 5 m, 10 m, 20 m, 30 m, 50 m, 75 m and 100 m to the treated area. The fluorescent dye pyranine was used as a tracer. In the laboratory, the amount of tracer in collectors was determined fluorometrically. The results show that in all three applications the drift decreased exponentially with the distance from the treated area. In addition, the highest drift values could be found at the edge of the forest, slightly lower drift values in the avenue and significantly lower drift values on a solitary tree were observed.