The goal of FPInnovations’ Wood Protection program is to assist industry deliver clean wood products to both export and domestic markets. Microorganisms (bacteria, mold, stain, decay, nematodes) can cause appearance problems, affect uptake of finishes, create phytosanitary and health concerns, and be involved in detoxification of wood preservatives. Users and consumers of wood often have questions about discolored wood.
Correct and rapid identification of factors causing wood discolouration is important in order to recognize appropriate mitigation options or control measures, to maintain market access for Canadian wood products, and assist in mediating disputes. This has led to a growing need for a structured approach for examination of wood discolouration and biodeterioration problems so that scientists involved have common approach and easily share the information during the assessment process. By taking advantage of recently acquired capabilities, in particular molecular biology methods, and in combination with existing knowledge and expertise, we developed an expert system (diagnostic tree) for rapid detection, identification and problem solving.
Four decision tree charts were developed to simplify the process of identifying the cause of wood discolorations. These steps are based on updated information, our booklet “Wood Discolorations and Their Prevention with Emphasis on Bluestain” and on our review of molecular–based technologies to aid identification and detection of ophiostomatoid (bluestain) fungi. The latter document has also been updated in this report. These charts are useful tools but cannot be a substitute for an expert assessment of discoloration issues, which sometimes may be complex in nature and may require a combination of structured methodology and a wealth of expert knowledge to assess.