Termiticide-treated posts and stakes have been tested at the field test site in Kagoshima, Southern Kyushu, Japan. Various commercial and alternative termiticides have been evaluated annually as TAI (termite attack index), calculated by the equation: TAI = R x P, where R is the mean of attack rating of 0 (sound), 10 (sign of tasting), 30 (slight attack), 50 (moderate attack), 100 (severe attack), and P is the ratio of attacked posts (stakes) to total posts (stakes) tested, expressed as 0.0-1.0 . CCA-impregnated Japanese cedar (Cryptomeria japonica) posts have well performed keeping 0 TAI over nine years. AAC-treated pine (Pinus radiata) stakes with 9.3 kg/m³ DDAC (didecyldimethyl ammonium chloride) or 9.4 kg/m³ BTAC (methylalkylbenzyltrimethyl ammonium chloride) have been free from decay, but they yielded 34 or 42 TAI after eight years. Improvement of termite resistance was revealed by addition of cupric chloride or cuprammonium chloride. Brushing treatment of pine (Pinus densiflora) stakes, with 200 g/m chlordane (2.0%), chlorpyrifos (1.0%) or tetrachlorvinfos (1.0%) solutions, did not provide the perfect control for five years, yielding 30, 42 and 48 TAI, respectively.

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