Test fungi for efficacy tests of anti-stain formulations were selected based on the assumptions that test fungi should be fungicide-tolerant antagonists and fungi resistant to both fungicides and fungicide- tolerant antagonists, and such fungi should be re-isolated from treated samples with the highest fungicidal concentration used for laboratory evaluation of fungicides. This paper discusses the results of the study performed to assess the above assumptions using the fungi re-isolated from treated samples used for the laboratory efficacy tests of NP-1 Plus against all fungal isolates from green radiata pine logs.

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