The report concerns the problems connected with blue stain in coniferous timbers stored in warehouses at wood-processing plants in SR Slovenia (Yugoslavia). The amounts of spruce-wood (Picea abies Karst.) found to have been infected with blue stain have been measured and some of the fungi causing the stain have been identified and their biology studied. It was found that the percentage of spruce-wood infected ranged between 3.58% and 9.17%, and that the most frequent fungus causing blue stain was Ceratocystis coerulescens (Münch) Bakshi. This is a fungus that grows very quickly (127.9 mm/10 days); the optimal temperature for its growth is about 22°C, and optimal moisture content from 45-55%. Its growth and sporulation are also influenced by different colours of the light spectrum.

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