Analyses of severely decayed or failed vineyard posts and examination of stake test data on effectiveness of copper-chrome-arsenate (CCA) preservatives have suggested two contributory causes of premature failure of vineyard posts: 1. Preservative retentions in posts are such that after 15 years' exposure some decay is inevitable. 2. The high arsenic, low chrome formulations with which the posts were treated are less effective in controlling decay than low arsenic high chrome formulations previously used in New Zealand, on the performance of which many concepts of CCA effectiveness are based.

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