This study is intended to recognize the behaviour and infestation rate of marine borers. Forty samples of pine wood, measuring 120 cm x 5 cm x 5 cm,. vertically floated at Ram but Island seashore. These samples are divided in to three section: top, midle and bottom. The observation were carried out after 1, 2, 3 and 6 months by splitting the sample.The results showed that the infestation started from the bottom upwards. The length and diameter of the burrow is controlled to a certain extent by the intensity of the borer population in the wood. When crowded, the borer may grow only a few cm. After six months of experiment, the infestation rate of samples showed the following regression equation; i.e, top section Y 1= 0, 134 (X)2,375, milde section Y2= 2,569 (X)1,113 and bottom section Y 3= 3,334 (X)0,142.
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