Tolerance of Some Fungi to a Water-Soluble Preservative and Its Components

The effect of other organisms associated with the test organism is a factor that should be considered in the critical evaluation of the preservative capacity of chemicals. The associated organisms may be of little apparent significance, yet they may modify the physiology of the prime organism or the toxic capacity of the preservative substances to such an extent as to render the treatment ineffective. Because of the invariable association of C. micaceus and F. oxysporum in treated fence posts, and since the former was much less tolerant of the treatments, it is suggested that the Fusarium, an ubiquitous soil saprophyte, probably entered the treated posts and in some way reduced the toxicity of the wood preservative, so that the entry and spread of the wood-decaying C. micaceus was facilitated. Thus the treated posts decay was brought about by the complementary action of these two organisms.

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