Wood samples of Teak (Tectona grandis) , Keruing (Dipterocarpus alatus),Yellow Balau (Shorea laevis) and Chengal (Balanocarpus heimii) were treated by Creosote, using Ruping method. The dimension of samples were 200 x 75 x 20 mm and the retention were 188, 186, 331, 40 kg /m3 respectively. Both treated and untreated samples were installed in sea water (Mahshar in Persian gulf and Bandar Torkman and Noshar in Caspian sea coasts) according to of IRG/WP-4432 (1985). In Mahshar coasts (Persian Gulf), during this installation period, the control samples (no treated) of Chengal and Keruing were sound, samples of Balau were IRG/WP-4432(1985). In Mahshar coast, after 6,10,20,23,27 months and in Caspian sea coasts every 6 months and after 11 years the samples were inspected according to recommendation severely degraded and Teak samples seriously attacked. All the treated samples after 27 months installation in seawater, were sound. In Caspian seacoasts, expect soft rot on the samples surfaces, both treated and untreated samples after 11years installation were sound. It is concluded that there are no marine borers in south coasts of Caspian sea.

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