Test blocks ol Pinus sylvestris sapwood were pressure impregnated with white spirit solutions of N-tritylmorpholine, either alone or in combination with permethrin, deltamethrin or cypermethrin. They were exposed in the intertidal zone at Mourilyan Harbour, North Queensland, Australia and subtidally at either end of the Panama Canal. After 5 months' exposure at Naos Island at the Pacific end of the Canal, all blocks were attacked by the pholad bivalve, Martesia striata. At Mourilyan Harbour, after exposure for one year, all blocks were riddled with teredinid borers, irrespective of type of preservative treatment. Attack by limnoriid borers, on the other hand, was restricted to blocks which contained no pyrethroids. A 0.1% m/v solution ol N-tritylmorpholine applied by pressure provides no significant protection for wood from molluscan marine borers.

Download document (338 kb)
free for the members of IRG. Available if purchased.

Purchase this document