ISHS Acta Horticulturae 531: II ISHS Conference on Fruit Production in the Tropics and Subtropics
XYLEM TRANSPORT OF THE PESTICIDE IMIDACLOPRID IN CITRUS |
| Authors: | Renate M. Mendel, U. Reckmann, F. Führ |
| Keywords: | Citrus sinensis, [pyridinyl-14C-methylene]imidacloprid; ConfidorR, autoradiographic examination, trunk-application, log Pow, tracer technique, water solubility |
| Abstract:
Experiments on trunk application of insecticides to fruit trees have been performed at the Institute of Radioagronomy, Research Centre Jülich GmbH, from 1993 to 1998. The present work is concerned with the internal distribution of imidacloprid in Citrus sinensis (L.) OSBECK. It especially pays attention to the tracer technique in combination with autoradiographic examinations as a tool to investigate plant-internal distribution of pesticides. Basic insights were obtained from an experiment with two-year-old orange trees (cv. ‘Newhall’, clone Iniasel 55–1, on Citrange Carrizo rootstocks) under environmentally controlled conditions. Additionally, a field trial with nine-year-old Valencia orange trees (cv. ‘Delta’ on Poncirus trifoliata (L.) RAF. rootstocks) was done in the subtropical North of the Republic of South Africa. In both experiments, [pyridinyl-14C-methylene] imidacloprid was applied to the trunk surfaces in a liquid research formulation AL 100 or as ConfidorR 200 SL. The results showed that bark-applied [14C]imidacloprid was distributed acropetally with the trees' transpiration stream and accumulated in the parenchyma of the laminae and the stipules. New shoots were preferentially supplied with active substance. Macro-autoradiograms of trunk and branch discs confirmed the long-distance transport of imidacloprid in the xylem. | |
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