Two co-operative programmes were discussed: 1) The IRG/COIPM co-operative programme on the CCA/CCB wood treatments and 2) The IRG/COIPM co-operative programme for testing the resistance of plastic wrapping for wooden pilings. The following was reported: In the wood treatment programme, beech, pine and alstonia wood samples have been pressure treated with 3 retentions (3%, 6% and 10%) of CCA and CCB and exposed in the sea, to find out if these timbers have selective resistance to attacks by marine borers and fungi. After nearly 8 years of exposure at many different locations it is becoming apparent that both treatments in pine and alstonia provide better protection than both treatments in beech. It is hoped to find out after chemical analysis why this is happening. In the polyolefin tests this plastic material was heat shrunk around small wooden blocks and exposed to borer attack in many different marine environments, and also in some terrestrial environments where termites were present, to determine if the material prevents attack by the borers. At two stations the test is now in its eighth year. So far the polyolefin material is still intact and has not been penetrated by borers. These two programmes are continuing.

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