Abstract

The degradation of cycloprate (hexadecyl cyclopropanecarboxylate) was studied on the foliage and fruit of dwarf apple and orange trees. The single major metabolite on both fruit and foliage was cyclo­ propanecarboxylic acid (up to 38% applied dose) with w-cyclopropyl fatty acids also abundant (up to 14% applied dose). These metabolites were found predominantly as polar conjugates, being relatively unimportant as free acids. The mixture of w-cyclopropyl fatty acids was resolved into 15-cyclo­ propylpentadecanoic, 15-cyclopropylpentadecenoic, and, apparently, 17 -cyclopropylheptadecenoic acids which contributed up to 8, 4, and 0.3 % of the applied dose, respectively. Cycloprate applied to the surface of fruit does not penetrate the outer surface and neither cycloprate nor cyclopropanecarboxylic acid translocated into fruit from treated leaves in significant levels «0.4%).

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