This study is evaluated by measuring the weight loss, and the ability of white and brown-rot fungi to attack unmodified and modified particleboards manufactured using spruce (Picea orientalis (L.) Link.) and alder (Alnus glutinosa) chips. The chips were reacted with acetic, succinic, maleic and phthalic anhydride at constant temperature for 3 hours then, hot pressed at 150 °C by using phenol formaldehyde (PF) resin. Particleboard specimens were subjected to fungal decay resistance tests performed according to EN 113 standard method using the brown-rot fungus, Coniophora puteana and white-rot fungus, Trametes versicolor. Chemical modified boards demonstrated increased durability against decay fungi. Especially acetic and succinic anhydride treatment reduced the weight losses more significantly than others.

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