Organic fungicides, such as propiconazole, have proven to be highly effective when used as a co-biocide in recently developed wood preservative formulations. They have however been ineffective when used as a stand alone preservative, particularly when used in ground contact (European Hazard class 4). Previous research, using the test methods of ENV 807 (1993), provided conflicting evidence regarding the efficacy of propiconazole when used in a ground contact situation, with the preservative appearing effective when tested using the vermiculite test and ineffective when using soil burial. This paper considers the use of the existing methods of this European Standard for use in the research and development of organic fungicides, and compares alternative micro-fungal spore combinations to that stated in EN 807 (1997) with the aim of improving test performance.

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