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1 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

1 2014

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Growth of Paecilomyces variotii fungus on salt-agar medium and on natural and chemically preserved wood

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Fojutowski A. , Kropacz A. , Koziróg A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2014

tom No. 87

64--69

Growth of Paecilomyces variotii fungus on salt-agar medium and on natural and chemically preserved wood. Paecilomyces variotii Bainer fungus (Pv) is one of filamentous fungi classified as belonging to Ascomycetes, Deuteromycetes groups, which are able to grow on many of softwood and hardwood species. These fungi (molds) commonly found around the world are responsible for the decrease of functional aesthetics of lignocellulosic materials and even soft rot of wooden materials. The growth of the fungi may be the reason for the drop of the material value, technological difficulties and, eventually, financial loses. It was indicated that Pv may cause yellow discoloration of oak, particularly during kiln drying of wood. The fungus is able to grow on softwood species as well. The aim of this research was to identify the growth rate of Pv fungus on salt-agar medium in comparison to other filamentous fungi and to compare its growth on Scots pine wood both natural and chemically preserved with model wood preservative. It was observed that the growth rate of Pv fungus during double-species tests on salt-agar medium was different depending on the species of the second fungus. Trichoderma viride and Chaetomium globosum fungi limited to some extent the growth of Pv fungus; however, no apparent antagonism was observed. The model wood preservative at 200g/m2 retention effectively controlled the growth of Pv, which in the case of natural Scots pine wood caused complete coverage of the wood surface.