Uptake By Grape Plants of Preservatives from Pressure-Treated Posts Not Detected

Leaf and stem tissue and fruit of grape plants (Vities rotundifolia Michx. cv. Magnolia) were analyzed for copper, chromium, and arsenic, 1, 2, and 3 years after planting 3 inches from copper-chrome-arsenate or fluor-chrome-arsenate dinitrophenol-treated southern pine posts. Quantities of copper in leaf and stem tissue and fruit of plants next to posts treated with copper-containing preservatives ranged from 4.9 to 10.5 ppm dry weight. The range in copper content in plants next to noncopper-treated posts ranged from 4.7 to 11.6 ppm. In all samples, chromium and arsenic contents were below 0.2 and 0.05 ppm, respectively, the limits of detection for the analytical methods used. Thus, no evidence was found suggesting uptake and translocation of wood preservative components into the leaf and stem tissue and fruit of plants from adjacent treated posts.

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