Abstract: A method to extend the functional life of wood structures by applying fundamental principles of biology and chemistry to control the activity of wood decay organisms while minimizing the use of environmentally hazardous chemicals. The method comprises applying a microbial treating solution to a portion of the wood structure subject to decay from microbial organisms; and covering the treated portion of the wood structure with a substantially insect impenetrable material. The method of the present invention is particularly advantageous for treating wood supporting structures including, but not limited to: telephone poles, utility poles, pilings, foundations and other building supports and the like. Also disclosed are novel wood structures.