A growing number of vineyard managers are pulling out timber posts and replacing them with steel or recycled plastic.The green-tinged timber posts that prop up the vines in wine-growing regions have long been part of Australia's rural landscape.
But the timber posts are treated with arsenic to stop termites eating them, copper to prevent fungal problems and chromium to bind the two other chemicals together.
The substance is known as CCA. Timber Preservers Association of Australia spokesman Harry Greaves says CCA is probably one of the most robust wood preservatives.
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