An anti-termite formulation of an environmental conservation type for soil treatment was developed. The formulation was composed of decanoic acid (n-capric acid, an fatty acid derived from coconut oil with ten carbons) as an active ingredient and other natural products. Experiments to examine the efficacy of the formulation against Coptotermes formosanus Shiraki were conducted at the termite field test site in Kagosihima Japan and in our laboratory. The smallest concentration of decanoic acid in soil required for complete prevention of termite attack was estimated. Further the rate of disappearance of decanoic acid in the soil treated with the formulation under various conditions was measured. The formulation with natural products have been still keeping an complete performance after five years of the field test.

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