Chemically protecting cellulosic string from microbial attack

The ability of various biocides to protect cellulosic string from decay was investigated by measuring tensile strength after various periods of soil burial. Copper naphthenate, the biocide currently used for this purpose, provided little protection. The nature of this failure at high levels of treatment was studied to determine the effect of copper tolerance developed through prior soil treatments. Several other chemicals, including oxine copper, didecyldimethylammonium chloride (Bardac,5), one formulation of 3-iodo-2-propylbutylcarbamate (IPBC) or P-20-T, Isothiazolone?, and chlorothalonil, provided good protection over a 10- to 19-week test period and appear to be useful replacements for copper naphthenate. Others, including zinc naphthenate, two other IPBC formulations, and Propiconazole?, provide little or no protection under the conditions employed.

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